Cruising Safety - Natural Hazards

A natural hazard is a threat of a naturally occurring event that will have a negative effect on people or the environment. Many natural hazards are interrelated, e.g. earthquakes can cause tsunamis.

Tropical Weather

Atlantic/Gulf Coast

All Clear for Cruisers

 

Eastern Pacific

All Clear for Cruisers

 advice > safety > Natural Hazards - Tsunamis
 

Earthquakes and Tsunamis

Notable Coastal Seismic Areas
Alaska Japan
Hawaii Indonesia
Caribbean/Mexico Italy
California/Washington  

 

 

 

 

 

Earthquakes

An earthquake (also known as a tremor or temblor) is the result of a sudden release of energy in the Earth's crust that creates seismic waves. Earthquakes are recorded with a seismometer, also known as a seismograph. The moment magnitude (or the related and mostly obsolete Richter magnitude) of an earthquake is conventionally reported, with magnitude 3 or lower earthquakes being mostly imperceptible and magnitude 7 causing serious damage over large areas. Ordinarily, subduction earthquakes under magnitude 7.5 on the Richter scale do not cause tsunamis, although some instances of this have been recorded.  Most destructive tsunamis are caused by earthquakes of magnitude 7.5 or more.

Tectonic plates map
USGS Tectonic Plates Map
earthquake epicenters 1963-1998
Earthquake epicenters 1963-1998
For more information about earthquakes  visit the USGS website.

Tsunami Warning Links

Pacific Tsunami Warning Ctr
West Coast & Alaska Tsunami Warning Ctr
 Caribbean Tsunami Warning Program
Puerto Rico Seismic N
etwork

 

Tsunamis

Anything that rapidly displaces a large volume of water can cause a tsunami. Typically, tsunamis are caused by underwater earthquakes, but landslides, volcanic eruptions, calving icebergs, and (very rarely) meteorite impacts can also generate tsunamis. These types of events can cause large disturbances in the surface of the ocean, and when gravity pulls the water back down, the tsunami is born. The original Japanese term literally translates as "harbor wave."

International Tsunami Information Center (ITIC) - Collocated with Pacific Region Headquarters, ITIC coordinates the efforts to extend the services of the national tsunami warning system of the United States to the international community in the Pacific basin.

 

Related Links:

Tropical Cyclones
Weather Updates
Travel Warnings
Safety Overview
Cruise Ship Fires
Sunken Passenger Ships
Sudden Lists/Rogue Waves
Unclassified Incidents
Incidents 2012
Incidents 2013
Incidents 2014

 

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