megatsunami

surge

Sudden powerful increase

• wall of waterVertical advancing flood
• inundationOverwhelming surge of water
• run-upPreliminary acceleration phase
• wave heightVertical measure of swells

wavelength · amplitude · propagation · coastal flooding · overwash · drawback · trough · bore

asteroid impact

Space rock collision event

• landslideMass of earth falling
• meteoriteSpace debris reaching Earth
• bolideDetonating meteor, very bright
• volcanic islandLand formed by eruptions

seamount · rockslide

devastation

Severe widespread destruction

• obliterationTotal destruction or erasure
• annihilationUtter, complete destruction
• infrastructure collapseFailure of essential public systems
• debris fieldArea of scattered remnants

rubble · ruins · flattened · swept away · submerged · displaced · casualties · mass evacuation

plate tectonics

Earth's crust mobility theory

• subductionPlate descending beneath another
• seismicRelating to ground tremors
• fault lineTectonic boundary crack
• earthquakeSeismic ground movement

epicenter · volcanism · lithosphere · submarine · oceanic · continental shelf · bathymetry

colossal

Extremely large in scale

• enormousExtremely large in scale
• massiveExtremely large and heavy
• titanicEnormously strong or large
• gargantuanExtremely immense in scope

immense · behemoth · monstrous · towering · astronomical · unprecedented · catastrophic · apocalyptic

humanitarian crisis

Large-scale emergency harming populations

• emergency responseOrganized action during crises
• relief effortsOrganized assistance after disasters
• survivorsThose still alive after
• refugeesPeople seeking safety elsewhere

displaced populations · trauma · recovery · reconstruction · mourning · aid · rescue operations · warning systems