RESTON, Virginia, January 13, 2010 (ENS) – At least 1,783 deaths resulted from earthquake activity in 2009, according to a new global report issued today by the U.S. Geological Survey.
The deadliest earthquake of the year was a magnitude 7.5 event that killed 1,117 people on the Indonesian island of Sumatra on September 30, a number confirmed by the United Nations Office for Coordination of Humanitarian Affairs.
The number of earthquake-related fatalities in 2009 was far less than the 2008 count of over 88,000. The high number of fatalities in 2008 was due to the severe magnitude 7.9 earthquake that occurred in Sichuan, China on May 12.
The strongest earthquake of 2009 was a magnitude 8.1 quake on September 29 in the Samoa Islands region. Tsunamis generated by that earthquake killed 192 people in American Samoa, Samoa and Tonga.
On the other side of the world, a magnitude 6.3 earthquake hit the medieval city of L’Aquila in central Italy on April 6, killing 295 people.
Overall, earthquakes took the lives of people in 15 countries on four continents during 2009, including Afghanistan, Bhutan, China, Costa Rica, Greece, Indonesia, Italy, Kazakhstan, Honduras, Japan, Malawi, Samoa, South Africa and Tonga, as well as in the U.S. territory of American Samoa.
Earthquakes injured people in 11 other countries, including the mainland United States, where a magnitude 4.4 earthquake on May 2 injured one person in the Los Angeles area.
The biggest 2009 earthquake in the 50 United States was, once again, in the Aleutian Islands of Alaska. The magnitude 6.5 earthquake occurred in the Fox Islands on October 13. It was felt at the towns of Akutan and Unalaska, but caused no casualties or damage.
The largest earthquake for the year in the contiguous United States was a magnitude 5.2 event on October 2 in the Owens Valley southeast of Lone Pine, California. Because of the sparse population in the epicentral area, this quake caused no damage although it was felt as far away as Merced and Los Angeles, California and Las Vegas, Nevada.
The year 2009 also marked the five-year anniversary of the magnitude 9.1 Sumatra-Andaman Island earthquake and subsequent tsunami on December 26, 2004. That quake and tsunami killed 227,898 people, which is the fourth largest casualty toll for earthquakes and the largest toll for a tsunami in recorded history.
As a consequence of that earthquake, the USGS has improved its earthquake notification and response capabilities.
Improvements include the addition of nine real-time seismic stations across the Caribbean basin, a seismic and tsunami prone region near the U.S. southern border.
The agency also has established a 24×7 earthquake operations center at the USGS National Earthquake Information Center at Golden, Colorado.
The USGS also has developed new tools for rapid evaluation of damage and population exposure to potentially damaging earthquakes.
The USGS estimates that several million earthquakes occur throughout the world each year, although most go undetected because they hit remote areas or have very small magnitudes.
The USGS National Earthquake Information Center publishes the locations for about 40 earthquakes per day, or about 14,500 annually, using a publication threshold of magnitude 4.5 or greater worldwide or 2.5 or greater within the United States.
On average, only 18 of these earthquakes occur at a magnitude of 7.0 or higher each year.
In the 2009 year, 17 earthquakes reached a magnitude of 7.0 or higher and one broke a magnitude of 8.0.
These statistics are higher than those of 2008, which experienced only 12 earthquakes over magnitude 7.0 and none over 8.0.
Factors such as the size of an earthquake, the location and depth of the earthquake relative to population centers, and fragility of buildings, utilities and roads all influence how earthquakes will affect nearby communities.
A complete list of 2009 earthquake statistics can be found on the Earthquake Information for 2009 website.
To monitor earthquakes worldwide, the USGS National Earthquake Information Center receives data in real time from nearly 990 stations in 85 countries, including the 150-station Global Seismographic Network, which is jointly supported by USGS and the National Science Foundation and operated by USGS in partnership with the Incorporated Research Institutions for Seismology consortium of universities.
In the United States, earthquakes pose significant risk to 75 million people in 40 states. The USGS and its partners in the multi-agency National Earthquake Hazard Reduction Program are working to improve earthquake monitoring and reporting capabilities via the USGS Advanced National Seismic System.