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Building a tsunami warning system.

The 26 December 2004 tsunami that devastated dev·as·tate  
tr.v. dev·as·tat·ed, dev·as·tat·ing, dev·as·tates
1. To lay waste; destroy.

2. To overwhelm; confound; stun: was devastated by the rude remark.
 coastal areas in Indonesia, Malaysia, Thailand, Myanmar, India, the Maldives, Sri Lanka Sri Lanka (srē läng`kə) [Sinhalese,=resplendent land], formerly Ceylon, ancient Taprobane, officially Democratic Socialist Republic of Sri Lanka, island republic (2005 est. pop. , and Somalia was produced by a magnitude 9.0 earthquake 155 kilometers southwest of northern Sumatra. The tsunami inundated in·un·date  
tr.v. in·un·dat·ed, in·un·dat·ing, in·un·dates
1. To cover with water, especially floodwaters.

 coasts with waves more than 30 feet high every 30-40 minutes for several hours. It killed more than 150,000 people and injured millions, making it one of the worst natural disasters the modern world has ever seen.

Could populations have been warned in advance? Not with the tsunami monitoring networks that exist in the affected area today, say officials with the National Oceanic and Atmospheric Administration Noun 1. National Oceanic and Atmospheric Administration - an agency in the Department of Commerce that maps the oceans and conserves their living resources; predicts changes to the earth's environment; provides weather reports and forecasts floods and hurricanes and  (NOAA NOAA
National Oceanic and Atmospheric Administration

Noun 1. NOAA - an agency in the Department of Commerce that maps the oceans and conserves their living resources; predicts changes to the earth's environment;
). Unlike the Pacific Ocean, which is wired for tsunami alerts by the United Nations Intergovernmental Oceanographic Commission The Intergovernmental Oceanographic Commission was established by resolution 2.31 adopted by the General Conference of Unesco. It first met in Paris at Unesco Headquarters from 19 to 27 October 1961. Initially, 40 States became members of the Commission. , the Indian Ocean Indian Ocean, third largest ocean, c.28,350,000 sq mi (73,427,000 sq km), extending from S Asia to Antarctica and from E Africa to SE Australia; it is c.4,000 mi (6,400 km) wide at the equator. It constitutes about 20% of the world's total ocean area.  is largely devoid of comparable sensor technologies that detect earthquakes and issue tsunami warnings to affected countries. According to according to
1. As stated or indicated by; on the authority of: according to historians.

2. In keeping with: according to instructions.

 NOAA officials, future warnings could be enhanced by the creation of an Indian Ocean tsunami warning center that would deploy coastal tide gauges to measure the amplitude of waves near tsunami source areas such as fault zones and volcanoes, and would establish a communications infrastructure to send and receive alerts.

Tsunami buoys also would be useful in an early warning system, NOAA officials say. At present, a network of six buoys is deployed by NOAA off the Aleutian Islands Aleutian Islands (əl`shən), chain of rugged, volcanic islands curving c.1,200 mi (1,900 km) west from the tip of the Alaska Peninsula and approaching Russia's Komandorski Islands.  in the Pacific Ocean. This network, called Deep Assessment and Reporting of Tsunamis, is composed of two parts: a sea floor sensor and a buoy that relays tsunami information to warning centers on the ground by satellite communication. NOAA estimates that about 50 such buoys are needed to adequately cover the world's oceans. On 6 January 2005 Senator Joe Lieberman (D-CT) proposed a $30 million package to develop these additional buoys, which the U.S. Congress is currently considering. Australian scientists are also designing an Indian Ocean tsunami alert system that is expected to cost US$20 million.

Still more help could come from the sky. On 10 January 2005, NOAA announced that its scientists had measured the height of the December 26 tsunami using data from four Earth-orbiting satellites passing over the affected area at the time. NOAA geophysicist Walter H.F. Smith said in an agency press release that the best application of satellite data to improve tsunami hazard forecasts may be in helping to map the ocean floor from space.

To be truly effective, any tsunami warning system A tsunami warning system is a system to detect tsunamis and issue warnings to prevent loss of life and property. It consists of two equally important components: a network of sensors to detect tsunamis and a communications infrastructure to issue timely alarms to permit evacuation  will need to be part of an overall disaster reduction strategy, says Helen Wood, senior advisor for systems and services in NOAA's National Environmental Satellite, Data, and Information Service. "You don't want a separate system that segregates tsunamis from earthquakes or cyclones, because populations on the coast are at risk from any and all of those things," she says.

Wood heads the secretariat for the Global Earth Observation System of Systems, an emerging international coalition that has set disaster reduction as one of nine priority areas [see "Terra Cognita: Using Earth Observing Systems to Understand Our World," p. A98 this issue]. "We had already identified tsunami and related instrumentation as a necessity," Wood says. "Now there's a sense of urgency. [The December 26 tsunami] was a catalyst for action. It's sad, but disaster often mobilizes people at all levels to take action."

The tragedy of hindsight. Similar disasters may be mitiagted in the future by better warning systems.


Waves of destruction. Composite satellite images created by NOAA measure the tsunami's height as it spread from the quake epicenter. The ability to make depth surveys from space may lead to improvements in models that forecast the hazardous effects of tsunamis.

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Title Annotation:Natural Disasters
Author:Schmidt, Charles W.
Publication:Environmental Health Perspectives
Date:Feb 1, 2005
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