Coastal Evacuation: How Fast Do You Need to Move?

Tsunami evacuation timing represents life-or-death calculation where seconds matter and overconfidence kills: The 2011 Japan tsunami arriving 15-40 minutes after M9.0 Tohoku earthquake gave coastal residents minimal time to reach safety while 2004 Indian Ocean tsunami striking Sumatra coast within 15-20 minutes left virtually no escape window for nearest communities. Understanding how fast you need to move during coastal evacuation requires analyzing tsunami arrival times, human movement speeds under stress, distance to safety zones, traffic congestion effects, vertical evacuation alternatives, and special population constraints where elderly, disabled, children, and tourists face mobility limitations that standard evacuation planning often ignores. The brutal mathematics show that walking speed of 3-4 mph (1.3-1.8 m/s) means covering half-mile in 7-10 minutes under ideal conditions—but reality introduces delays, crowds, debris obstacles, uphill terrain, darkness, and panic that can double or triple evacuation times making "high ground or as far inland as possible" insufficient guidance for coastal communities facing 10-40 minute warning windows.

Tsunami wave speeds create paradox where waves travel 500-600 mph (800-970 km/h) in deep ocean yet slow to 20-40 mph (32-64 km/h) in shallow coastal waters—still far faster than any human can run—while wave height amplifies from barely noticeable meter in deep water to 10-40+ meters devastating coastal communities. The warning time available depends entirely on epicenter distance: Local tsunamis from nearby offshore earthquakes provide 5-30 minutes, regional tsunamis from 100-1,000 kilometers away allow 30 minutes to 2-3 hours, and distant tsunamis crossing ocean basins give 4-24 hours enabling comprehensive evacuations. Japanese tsunami evacuation maps designate color-coded zones based on arrival time and inundation depth with red zones (immediate danger, <10 minutes) requiring instant evacuation to pre-identified buildings or high ground, yellow zones (10-30 minutes) allowing somewhat more time, and outer zones (30+ minutes) providing opportunity for vehicular evacuation though traffic congestion often makes walking faster paradoxically.

Real-world evacuation performance during 2011 Japan tsunami revealed both successes and tragic failures: Kamaishi City's elementary and middle school students achieving 99.8% survival through regular tsunami drills creating automatic evacuation response while nearby Okawa Elementary School's delayed evacuation killed 74 of 108 students and teachers when waves arrived before reaching designated hill 150 meters away. The difference between survival and death measured in 2-5 minute decisions where teachers at Okawa debated evacuation for precious minutes while Kamaishi students evacuated immediately upon feeling earthquake without waiting for official instructions. Vertical evacuation—ascending designated tsunami evacuation buildings rather than fleeing horizontally inland—saved thousands during 2011 where 12-story buildings provided refuge when ground-level horizontal evacuation proved impossible, yet not all buildings designated "tsunami evacuation centers" survived with some structures collapsing under wave force killing occupants who believed they'd reached safety.

This comprehensive guide examines coastal evacuation timing through tsunami wave speed and arrival time calculations, human movement speeds across demographics and conditions, distance-versus-time evacuation zones, traffic congestion impacts transforming highways into parking lots, vertical evacuation strategies and building requirements, special population challenges including elderly with walkers requiring 10-20 minutes to cover distances able-bodied adults traverse in 3-5 minutes, nighttime evacuation complications where darkness eliminates visual cues and slows movement 30-50%, seasonal tourist surges overwhelming local evacuation infrastructure, lessons from 2011 Japan and 2004 Indian Ocean disasters, and practical strategies for coastal residents and visitors calculating whether you can reach safety in available time. The question "how fast do you need to move" has no universal answer—it depends on where you are when warning comes, where safety is located, your physical capabilities, time of day, season, weather conditions, and whether you evacuate immediately or waste critical minutes gathering belongings, waiting for family, or debating whether threat is real. Those who survive tsunami evacuations share common characteristic: they moved immediately, moved decisively, and didn't stop until reaching safety regardless of how absurd the threat seemed initially.

Tsunami Wave Speeds and Arrival Times

Physics of Tsunami Propagation

Understanding how fast tsunamis travel determines available evacuation time—the fundamental constraint driving all coastal evacuation planning.

Deep Ocean Speed (Depth >1,000 meters):

• Speed formula: Velocity = √(g × depth) where g = 9.8 m/s²
• At 4,000m depth: √(9.8 × 4,000) = ~200 m/s = 720 km/h = 450 mph
• At 5,000m depth: ~220 m/s = 790 km/h = 490 mph
• Implication: Tsunamis cross Pacific Ocean (10,000 km) in 12-15 hours
• Wave height in deep ocean: Typically 0.5-1 meter—imperceptible to ships

Shallow Water Deceleration:

• At 200m depth: ~45 m/s = 160 km/h = 100 mph
• At 100m depth: ~30 m/s = 110 km/h = 70 mph
• At 50m depth: ~22 m/s = 80 km/h = 50 mph
• At 10m depth: ~10 m/s = 36 km/h = 22 mph
• Wave height amplification: As speed decreases, height increases dramatically

Coastal Impact Speed:

• Tsunamis hit coastline at 20-40 mph (32-64 km/h) typical
• Faster than any human can run (sprint speed ~15-20 mph for short bursts)
• Water continues pushing inland after initial wave—multiple surges over hours

Warning Time by Tsunami Type

Local Tsunami (Epicenter <100 km offshore):

Regional Tsunami (100-1,000 km away):

• 300 km: 30-60 minutes arrival
• 500 km: 1-2 hours arrival
• 1,000 km: 2-3 hours arrival
• Evacuation feasibility: Sufficient time for organized evacuation if warnings issued promptly

Distant Tsunami (>1,000 km trans-oceanic):

• 2,000-5,000 km: 4-8 hours
• 5,000-10,000 km: 8-16 hours
• 10,000+ km: 16-24 hours
• Example: Chile earthquake tsunami reaches Japan in ~24 hours
• Evacuation feasibility: Ample time for comprehensive evacuation

Human Movement Speeds: The Evacuation Reality

Walking Speeds Across Populations

Evacuation planning must account for actual human movement speeds—not idealized "healthy adult" assumptions.

Able-Bodied Adults (Ages 20-60):

Elderly (Age 65+):

• Average walking speed: 2-3 mph (0.9-1.3 m/s)
• With walker/cane: 1-2 mph (0.4-0.9 m/s)
• With wheelchair assistance: 2-3 mph if pushed, 1-2 mph self-propelled
• Implications: Distance able-bodied adult covers in 10 minutes takes elderly 15-30 minutes

Children:

• Ages 10-15: Similar to adults (3-4 mph)
• Ages 5-9: 2-3 mph sustained, tire quickly
• Ages 2-4: 1-2 mph, often need to be carried
• Infants: Must be carried—reduces parent speed 20-40%

Disabled Populations:

• Manual wheelchair users: 1-3 mph on flat ground, much slower on inclines
• Electric wheelchair: 3-5 mph but vulnerable to debris/water damage
• Vision impaired: 1-2 mph without assistance, faster with guide
• Cognitive impairments: Variable—may refuse to evacuate or become disoriented

Real-World Speed Reductions

Environmental Factors:

• Uphill evacuation: 30-50% speed reduction on moderate slopes (10-20 degrees)
• Stairs: 40-60% slower than flat ground walking
• Darkness: 30-50% slower—people can't see obstacles, unsure of route
• Rain/wet conditions: 20-30% slower due to slippery surfaces, reduced visibility
• Debris field: 50-80% slower navigating rubble, downed trees, damaged buildings

Psychological Factors:

• Panic: Can either speed movement (adrenaline) or slow it (freezing, poor decisions)
• Crowds: Dense crowds reduce speed to 1-2 mph regardless of individual capability
• Uncertainty: Not knowing where to go slows evacuation 30-50% as people hesitate
• Belongings: Carrying items reduces speed 10-30% depending on weight/bulk

Distance-to-Safety Calculations

Evacuation Zone Mapping

Most coastal tsunami-prone areas define evacuation zones based on modeled inundation and estimated travel times.

Typical Zone Definitions (Japan Model):

Distance Benchmarks:

• 500 meters (0.3 miles): 10 minutes brisk walk; 6 minutes power walk; 3-4 minutes jog
• 1 kilometer (0.6 miles): 15-20 minutes brisk walk; 12 minutes power walk; 6-8 minutes jog
• 2 kilometers (1.2 miles): 30-40 minutes brisk walk; 24 minutes power walk; 12-16 minutes jog

Elevation Requirements:

• Minimum safe elevation varies by location—typically 15-30 meters (50-100 feet) above sea level
• Some areas (Japan, Pacific Northwest) require 30-50 meters for megathrust tsunami
• Rule of thumb: Higher is always safer; don't stop at minimum if you can go higher

Case Study: Can You Make It?

Scenario: You're on beach when strong earthquake hits (assume local tsunami, 15-minute arrival)

Elderly/Disabled Adjustments:

• Scenarios marked "YES" become "TIGHT" for slow walkers
• Scenarios marked "TIGHT" become "NO" for wheelchair users on their own
• Vertical evacuation becomes only option for many special populations in red zones

Traffic Congestion: When Driving Is Slower Than Walking

The Evacuation Paradox

Counter-intuitively, attempting vehicular evacuation often results in slower escape than walking during local tsunamis.

Why Traffic Fails in Tsunami Evacuations:

1. Simultaneous departure: Entire coastal community tries to drive inland at same instant
2. Limited routes: Coastal areas often have 1-3 roads leading inland creating bottlenecks
3. Intersections: Traffic lights fail after earthquake; no one yields creating gridlock
4. Abandoned vehicles: Cars run out of gas or break down blocking lanes
5. Pedestrian conflicts: Walkers cross between cars slowing traffic further

Speed Comparison: Vehicle vs Walking

2011 Japan Experience:

• Many victims died trapped in cars in gridlocked traffic as water arrived
• Post-event surveys: 30-40% of fatalities were people who attempted vehicular evacuation
• Survivors reported abandoning cars and running when they realized traffic wasn't moving
• Lesson: If traffic is clearly gridlocked within first 5 minutes, abandon vehicle and walk/run

When Driving Makes Sense

Driving is appropriate when:

• Distance >2 km: Too far to walk in available time
• Regional tsunami: 1-2+ hour warning allows time even with traffic
• Special needs: Transporting elderly, disabled, young children who can't walk distance
• Off-peak times: Middle of night or early morning when roads less congested
• Clear route visible: Can see road ahead is moving, not gridlocked

Driving rules for tsunami evacuation:

• If you choose to drive, commit immediately—don't wait 5-10 minutes "seeing what others do"
• Have predetermined route identified beforehand (not GPS—may not work)
• If gridlock develops within 3-5 minutes, abandon car immediately and run
• Don't abandon car blocking road—pull to side if possible
• Never return to car once you've abandoned it

Vertical Evacuation: When Horizontal Escape Impossible

Concept and Requirements

Vertical evacuation—ascending designated buildings instead of fleeing inland—saves lives when horizontal evacuation is impossible due to distance, time, or mobility constraints.

Ideal Vertical Evacuation Building Characteristics:

• Height: Minimum 3-4 stories (12-15 meters); 5-6+ stories (20+ meters) preferred for major tsunami
• Construction: Reinforced concrete or steel frame—NOT unreinforced masonry
• Foundation: Deep pilings or reinforced foundation resistant to scour (water undermining)
• Design load: Engineered to withstand lateral tsunami forces (150-300 kN/m² typical)
• Access: Exterior stairs accessible 24/7 (not locked interior stairwells)
• Capacity: Roof/upper floor space for hundreds of people
• Supplies: Emergency supplies, blankets, first aid for people sheltering hours to days

Not All Tall Buildings Are Safe:

• Buildings not specifically designated may collapse under tsunami force
• Large ground-floor openings (parking garages, shops) create vulnerability
• Older buildings not designed for lateral loads may fail
• Soft-story buildings (weak ground floor) especially vulnerable

2011 Japan Vertical Evacuation Results

Successes:

• Designated tsunami evacuation buildings saved thousands
• 12-15 story reinforced concrete buildings generally survived even direct hit by 15-20m waves
• Purpose-built tsunami evacuation towers (concrete platforms on pilings) performed excellently
• People who reached 4th floor or higher in solid buildings nearly all survived

Failures:

• Some designated evacuation buildings collapsed killing occupants
• Buildings with inadequate foundation undermined and toppled
• Soft-story buildings (ground-floor shops/parking) pancaked
• People sheltering on 2nd-3rd floors swept away in areas with >10m waves

Critical Lessons:

• Go as high as possible—don't stop at "minimum safe floor"
• Tsunami height unpredictable—actual waves may exceed predictions
• Stay in building until all-clear given (may be multiple waves over 6-12 hours)
• Bring others with you—don't leave disabled/elderly behind

Special Populations: The Evacuation Equity Challenge

Elderly and Mobility-Impaired

Standard evacuation planning assumes able-bodied adults—but 15-25% of coastal populations need assistance.

Time Multipliers for Common Conditions:

Assisted Evacuation Considerations:

• Carrying one person requires 2 able-bodied adults—reduces total population evacuation capacity
• Wheelchairs nearly impossible to push uphill or on stairs
• Evacuation chairs (stair-capable stretchers) require training to use safely
• Many elderly refuse to evacuate believing they'll "slow others down"—persuasion takes time

Tourist and Visitor Vulnerabilities

Why Tourists Are High-Risk:

1. Unfamiliar with area: Don't know where high ground is or designated evacuation routes
2. Language barriers: May not understand warnings, signs, or instructions
3. Lack preparation: No emergency supplies, don't know local protocols
4. False security: Assume "authorities will tell us what to do"—waste time waiting for instructions
5. Seasonal concentration: Summer beach crowds 5-10× normal population overwhelming evacuation infrastructure

2004 Indian Ocean Tsunami Tourist Deaths:

• Thailand (Phuket, Phi Phi Island): Thousands of tourists killed
• Many deaths from delayed evacuation—tourists didn't recognize danger
• Some returned to beach after first wave receded to "see tsunami"—killed by larger second wave
• Language barriers prevented understanding warnings

Children and Schools

Kamaishi "Miracle" (2011 Japan):

• Kamaishi City elementary and middle schools: 99.8% student survival rate
• Secret: Regular tsunami drills (monthly) created automatic evacuation response
• Students evacuated immediately upon feeling earthquake—no waiting for adult instructions
• Students helped younger children and elderly neighbors during evacuation
• Lesson: Education and drills save lives more effectively than any infrastructure

Okawa Elementary Tragedy (2011 Japan):

• 74 of 108 students and teachers killed
• Designated evacuation site (hill) only 150 meters away—but teachers debated for 30-40 minutes before evacuating
• By time evacuation began, tsunami already arriving
• Lesson: Hesitation kills; protocols requiring adult decision-making can be fatal

Nighttime and Weather: Evacuation Multipliers

Darkness Challenges

Speed Reductions in Dark:

• Visual navigation: 30-50% slower without artificial light
• Earthquake typically knocks out power—streetlights, building lights all dark
• Flashlights help but limit field of view
• Uneven terrain, debris, obstacles invisible until you trip
• Psychological: Darkness increases fear, reduces confidence in route

Mitigation Strategies:

• Keep flashlight and spare batteries by bed—grab during evacuation
• Memorize evacuation route during daylight so you can navigate by feel/memory
• Some Japanese communities install reflective markers on evacuation routes visible in flashlight
• Glow-in-dark pavement paint on evacuation routes (implemented some areas)

Adverse Weather Impact

Rain/Storm Conditions:

• Reduced visibility: Can't see route signs, landmarks
• Slippery surfaces: 20-30% slower walking speed, fall risk
• Hypothermia risk: Getting soaked in cold water dangerous especially if sheltering outdoors for hours
• Flooding complications: Existing flood water makes it harder to recognize tsunami arrival

Wind Effects:

• Strong headwinds: 10-20% slower walking speed
• Debris becomes projectiles: Roofing material, branches, unsecured items dangerous
• Structural damage: Earthquake + high winds = more damaged buildings blocking routes

The Psychological Factor: Why People Delay

Common Evacuation Hesitations

Reasons People Don't Evacuate Immediately:

1. "It won't be that bad": Normalcy bias—tendency to underestimate danger
2. "I need to get my things": Attempting to gather valuables, documents, pets
3. "I need to find my family": Waiting for spouse/children to return home
4. "Let me check the news": Waiting for official confirmation of danger
5. "I'll wait and see what others do": Social proof—following crowd even if crowd is wrong
6. "My house is new/strong": Overconfidence in building safety

Time Lost to Hesitation:

• Each minute of delay = 100-200 meters less distance covered (at brisk walk)
• 10 minutes gathering belongings = 1-2 km less distance = potential difference between life and death
• Social proof delay: If 100 people wait to see what others do, all 100 are delayed

The Survivors' Mindset

What Survivors Did Differently:

• ✅ Evacuated within 60-90 seconds of feeling earthquake/hearing warning
• ✅ Left belongings behind without hesitation
• ✅ Trusted their instincts over official announcements (which sometimes came late or wrong)
• ✅ Helped others evacuate without sacrificing own safety
• ✅ Kept moving until reaching safety—didn't stop partway thinking "this is high enough"
• ✅ Stayed at evacuation point until official all-clear (multiple waves over hours)

Practical Evacuation Planning

Pre-Event Preparation

Know Your Zone and Routes:

• Find local tsunami hazard maps (usually available from emergency management websites)
• Identify if your home, workplace, children's schools are in evacuation zones
• Walk evacuation routes during daylight—time how long it takes at different paces
• Identify 2-3 alternate routes in case primary route blocked
• Locate designated evacuation buildings if horizontal evacuation not feasible

Family Planning:

• Meeting point: Designate specific evacuation location where family will reunite
• Communication plan: Assume cell phones won't work—have predetermined plan
• School protocols: Know school evacuation procedures—schools will NOT release children during tsunami, they'll evacuate together
• Work plans: Each family member knows where others will evacuate from different locations
• Pet plan: Decide beforehand—taking pet acceptable ONLY if it doesn't delay evacuation

Go-Bag Preparation:

• Keep small backpack by door with essentials (if you have 30 seconds, grab it; if not, leave it)
• Contents: ID, cash, medications, phone charger, flashlight, water bottle, energy bars, whistle
• Keep car gas tank above half-full if you might need to drive

During Evacuation

Immediate Actions (First 60 seconds):

1. Shout "TSUNAMI!" to alert others
2. Grab go-bag ONLY if at door—don't search for it
3. Help immediate neighbors (knock on doors while moving, don't wait for response)
4. Start moving toward predetermined evacuation point

During Movement:

• Move as fast as YOU can sustain—not as fast as others (pace yourself to avoid exhaustion)
• If in vehicle and traffic stops, abandon vehicle immediately and walk/run
• Help others if possible without endangering yourself (carry children, guide elderly)
• Don't stop to take photos/videos—every second counts
• If trapped between tsunami and high ground, seek vertical evacuation immediately

At Evacuation Point:

• Don't stop at minimum safe height—go higher if possible
• Stay until official all-clear (may be 6-12 hours after last wave)
• Multiple waves common—second or third wave often largest
• Help organize supplies, first aid for injured evacuees
• Account for family members but don't leave safe area to search

Conclusion: Preparation Determines Survival

Coastal evacuation timing represents brutal mathematics where tsunami wave physics, human movement speeds, distance-to-safety, and available warning time determine survival with margin for error measured in single-digit minutes or less. The 2011 Japan M9.0 Tohoku earthquake generating tsunami arrival times of 15-40 minutes along nearest coasts created scenarios where residents 1 kilometer from high ground faced achievable but tight evacuations requiring immediate response and brisk sustained movement while those 2+ kilometers from safety needed vertical evacuation or faced statistical improbability of horizontal escape. The wave speed deceleration from 500-600 mph in deep ocean to 20-40 mph at coastline creates deceptive situation where tsunami appears slow-moving on approach yet moves far faster than running speed while continuing to push inland after initial wave with multiple surges over 6-12 hours killing those who return prematurely or stop evacuating at inadequate elevation.

Human movement speeds across populations—able-bodied adults achieving 3-4 mph brisk walk, elderly with walkers dropping to 1-2 mph, wheelchair users requiring assistance on any incline, children under 5 needing to be carried reducing parent speed 20-40%—mean that standard evacuation planning assuming healthy adult capabilities systematically underestimates required evacuation time for 20-30% of coastal populations creating equity crisis where most vulnerable face highest death risk. The 2011 Kamaishi elementary students' 99.8% survival rate through instant automatic evacuation upon earthquake shaking versus Okawa Elementary's 74 deaths from 30-40 minute debate demonstrates that hesitation kills more effectively than any tsunami while cultural factors including normalcy bias, social proof following crowd behavior, and attempts to gather belongings transform 5-10 minute evacuations into 15-20 minute death sentences.

Traffic congestion effects during simultaneous mass evacuation convert 30-60 mph highway speeds into 0-5 mph gridlock where 2011 Japan experience showed 30-40% of tsunami deaths occurred among people trapped in vehicles as water arrived, validating counter-intuitive reality that walking often proves faster than driving during local tsunami evacuations with 10-30 minute warning windows. The vertical evacuation alternative—ascending designated tsunami-resistant buildings rather than fleeing horizontally inland—saved thousands during 2011 where reinforced concrete structures 4+ stories proved survivable refuges yet also revealed failure modes where soft-story buildings with ground-floor parking garages pancaked, inadequate foundations undermined causing collapses, and people sheltering on 2nd-3rd floors swept away in areas experiencing >10 meter waves. Environmental multipliers including darkness reducing movement speeds 30-50%, uphill terrain causing 30-50% slowdown, debris fields cutting speeds 50-80%, rain creating slippery conditions, and seasonal tourist surges quintupling coastal populations all compound evacuation challenges transforming theoretical 15-minute horizontal escapes into 25-30 minute practical realities.

The psychological dimension of evacuation hesitation—normalcy bias causing underestimation of danger, social proof driving people to wait and see what others do, attempts to gather belongings or wait for family consuming precious minutes, overconfidence in building safety or distance from coast creating false security—explains why 2004 Indian Ocean tsunami killed thousands who had 15-30 minutes warning yet spent critical time debating, gathering valuables, or photographing receding ocean instead of evacuating immediately. Survivor accounts uniformly describe instant decision-making upon feeling strong earthquake shaking or receiving warning, abandoning all belongings without debate, helping neighbors while moving continuously toward safety, ignoring official announcements that sometimes came late or provided inadequate guidance, and refusing to stop at intermediate points believing "this is high enough" until reaching known safe elevation or designated evacuation building.

Practical coastal evacuation preparation requires pre-event investment: identifying your tsunami zone classification through local hazard maps, timing multiple evacuation routes during daylight at various paces to understand actual required time, locating designated vertical evacuation buildings as alternatives when horizontal escape infeasible, establishing family communication plans recognizing cell networks will fail, preparing go-bags containing essentials positioned for 30-second grab, and conducting personal evacuation drills creating muscle-memory response eliminating decision-making delay during actual emergency. The presence or absence of regular tsunami drills separates high-survival communities like Kamaishi where monthly exercises trained automatic response from low-survival areas where unfamiliarity with protocols, routes, and designated shelters caused fatal confusion and delay. Special population considerations—elderly requiring 50-100% more time, disabled needing assistance or vertical evacuation, tourists unfamiliar with area and evacuation procedures, children in schools following institutional protocols rather than family plans—demand community-level planning ensuring vulnerable populations receive assistance rather than abandonment during mass evacuation.

The question "how fast do you need to move" produces location-specific, capability-dependent, condition-variable answers ranging from "immediate sprint" for those in red zones 500-1000 meters from safety to "brisk sustained walk" for yellow zones with 30+ minute warning windows, yet universal constant remains: immediate response determines survival where 60-second evacuation initiation versus 5-10 minute hesitation represents difference between reaching safety with margin and perishing meters short of salvation. Pre-designated evacuation buildings provide life-saving option when horizontal evacuation impossible due to distance, mobility limitations, or inadequate warning time, yet only if buildings meet structural requirements for tsunami resistance, evacuees ascend to 4th floor minimum rather than stopping at ground-level entry, and populations remain sheltered through full 6-12 hour tsunami duration resisting urge to descend after first wave passes. Understanding tsunami physics, warning systems, and evacuation timing transforms abstract coastal hazard into concrete personal survival calculation: measure distance from your location to nearest high ground or designated evacuation building, divide by realistic movement speed accounting for your physical capabilities and environmental conditions, compare result to estimated warning time for local versus regional tsunami scenarios. If mathematics shows insufficient margin, identify closer vertical evacuation options or relocate residence/workplace outside tsunami zones. When earthquake shaking begins lasting 20+ seconds or any tsunami warning arrives, mathematics becomes irrelevant—you evacuate immediately, move continuously until reaching safety, stay sheltered until official all-clear regardless of how long that takes. Coastal evacuation survival requires neither extraordinary athletic ability nor expensive equipment but rather pre-event preparation, instant decision-making, and sustained movement toward pre-identified safety—skills and behaviors available to anyone willing to invest time learning local hazards and practicing appropriate response. The tsunami is coming—your preparation determines whether you're among survivors crediting instant evacuation for their lives or among casualties whose hesitation measured in single-digit minutes proved fatal.