The 2009 Swan Islands earthquake occurred on May 28 at with a

moment magnitude The moment magnitude scale (MMS; denoted explicitly with or Mw, and generally implied with use of a single M for magnitude) is a measure of an earthquake's magnitude ("size" or strength) based on its seismic moment. It was defined in a 1979 pape ...

of 7.3 and a maximum Mercalli intensity of VII (''Very strong''). The

epicenter The epicenter, epicentre () or epicentrum in seismology is the point on the Earth's surface directly above a hypocenter or focus, the point where an earthquake or an underground explosion originates. Surface damage Before the instrumental pe ...

was located in the

Caribbean Sea The Caribbean Sea ( es, Mar Caribe; french: Mer des Caraïbes; ht, Lanmè Karayib; jam, Kiaribiyan Sii; nl, Caraïbische Zee; pap, Laman Karibe) is a sea of the Atlantic Ocean in the tropics of the Western Hemisphere. It is bounded by Mexico ...

, northeast of the island of

Roatán Roatán () is an island in the Caribbean, about off the northern coast of Honduras. It is located between the islands of Utila and Guanaja, and is the largest of the Bay Islands of Honduras. The island was formerly known in English as Ru ...

, 19 miles northeast of Port Royal, Isla de Bahias, 15 miles northwest of Isla Barbaretta, and north-northeast of

La Ceiba La Ceiba () is a municipality, the capital of the Honduran department of Atlántida and a port city on the northern coast of Honduras in Central America. It is located on the southern edge of the Caribbean, forming part of the south eastern bo ...

. Three aftershocks followed the earthquake within magnitude 4 range.

Earthquake

The earthquake occurred at a depth of around on a

transform fault A transform fault or transform boundary, is a fault along a plate boundary where the motion is predominantly horizontal. It ends abruptly where it connects to another plate boundary, either another transform, a spreading ridge, or a subducti ...

zone known as the

Swan Islands Transform Fault The Swan Islands Transform Fault is an active left-lateral (sinistral) strike-slip fault zone that forms part of the boundary between the Caribbean Plate and the North American Plate. It runs along the southern boundary of the Cayman Trough from ...

on the southern margin of the

Cayman Trough __NOTOC__ The Cayman Trough (also known as the Cayman Trench, Bartlett Deep and Bartlett Trough) is a complex transform fault zone pull-apart basin which contains a small spreading ridge, the Mid-Cayman Rise, on the floor of the western Caribb ...

. It was a result of left-lateral

strike-slip faulting In geology, a fault is a planar fracture or discontinuity in a volume of rock across which there has been significant displacement as a result of rock-mass movements. Large faults within Earth's crust result from the action of plate tectonic ...

. The Swan Island Transform Fault forms part of the

tectonic Tectonics (; ) are the processes that control the structure and properties of the Earth's crust and its evolution through time. These include the processes of mountain building, the growth and behavior of the strong, old cores of continents ...

boundary between the

North American Plate The North American Plate is a tectonic plate covering most of North America, Cuba, the Bahamas, extreme northeastern Asia, and parts of Iceland and the Azores. With an area of , it is the Earth's second largest tectonic plate, behind the Pacifi ...

and the

Caribbean Plate The Caribbean Plate is a mostly oceanic tectonic plate underlying Central America and the Caribbean Sea off the north coast of South America. Roughly 3.2 million square kilometers (1.2 million square miles) in area, the Caribbean Plate borde ...

, and continues onshore as the

Motagua Fault The Motagua Fault (also, Motagua Fault Zone) is a major, active left lateral-moving transform fault which cuts across Guatemala. It forms part of the tectonic boundary between the North American Plate and the Caribbean Plate. It is considere ...

and the

Chixoy-Polochic Fault The Chixoy-Polochic Fault, also known as Cuilco-Chixoy-Polochic Fault, is a major fault zone in Guatemala and southeast Mexico. It runs in a light arc from the east coast of Guatemala to Chiapas, following the deep valleys of the Polochic River, Chi ...

. The 30-second offshore quake was felt in Guatemala,

El Salvador El Salvador (; , meaning " The Saviour"), officially the Republic of El Salvador ( es, República de El Salvador), is a country in Central America. It is bordered on the northeast by Honduras, on the northwest by Guatemala, and on the south by ...

Belize Belize (; bzj, Bileez) is a Caribbean and Central American country on the northeastern coast of Central America. It is bordered by Mexico to the north, the Caribbean Sea to the east, and Guatemala to the west and south. It also shares a wa ...

, and as far as

Cancún Cancún ( ), often Cancun in English (without the accent; or ) is a city in southeast Mexico on the northeast coast of the Yucatán Peninsula in the Mexican state of Quintana Roo. It is a significant tourist destination in Mexico and the seat ...

Mexico Mexico ( Spanish: México), officially the United Mexican States, is a country in the southern portion of North America. It is bordered to the north by the United States; to the south and west by the Pacific Ocean; to the southeast by Guate ...

. It was also felt in parts of

Nicaragua Nicaragua (; ), officially the Republic of Nicaragua (), is the largest Sovereign state, country in Central America, bordered by Honduras to the north, the Caribbean Sea, Caribbean to the east, Costa Rica to the south, and the Pacific Ocean to ...

, Costa Rica,

Panama Panama ( , ; es, link=no, Panamá ), officially the Republic of Panama ( es, República de Panamá), is a transcontinental country spanning the southern part of North America and the northern part of South America. It is bordered by Co ...

, Colombia,

Cuba Cuba ( , ), officially the Republic of Cuba ( es, República de Cuba, links=no ), is an island country comprising the island of Cuba, as well as Isla de la Juventud and several minor archipelagos. Cuba is located where the northern Caribbea ...

Jamaica Jamaica (; ) is an island country situated in the Caribbean Sea. Spanning in area, it is the third-largest island of the Greater Antilles and the Caribbean (after Cuba and Hispaniola). Jamaica lies about south of Cuba, and west of Hispan ...

, and the Cayman Islands. Analysis of

geodetic Geodesy ( ) is the Earth science of accurately measuring and understanding Earth's figure (geometric shape and size), orientation in space, and gravity. The field also incorporates studies of how these properties change over time and equivale ...

and seismic data indicated that up to 1 meter of slip occurred across a 250-km-long

fault rupture In seismology, an earthquake rupture is the extent of slip that occurs during an earthquake in the Earth's crust. Earthquakes occur for many reasons that include: landslides, movement of magma in a volcano, the formation of a new fault, or, most ...

. Although the epicenter was located far off the coast of Central America, the long rupture contributed to severe damage in Honduras. The earthquake ruptured a segment of plate boundary immediately east of the 1976 earthquake rupture on the Motagua Fault.

Tsunami

A tsunami was observed with heights of in

Motagua River The Motagua River () is a river in Guatemala. It rises in the western highlands of Guatemala where it is also called Río Grande, and runs in an easterly direction to the Gulf of Honduras. The final few kilometres of the river form part of the ...

, Guatemala.

Damage

The earthquake caused at least seven fatalities, 40 injuries, and more than 130 collapsed or damaged buildings across northern Honduras. Two important bridges and a number of levees and port terminals were also seriously damaged.Belarbi, A., Luna, R., Applegate, K., Calderon, H., Rivera, O., Lopez, L.A. and Rodriguez, R., 2009
The M7.3 Honduras Earthquake of May 28, 2009
EERI Special Earthquake Report, 1–4 In the Guatemalan department of Izabal, 35 buildings were destroyed and 80 were damaged. In Belize, at least 5 buildings were also destroyed and 25 were damaged. In Roatan, one home was damaged and one injury occurred. The earthquake caused an estimated $37 million worth of damage, and electricity, Internet and telephone connections were cut throughout the majority of Honduras. A

tsunami A tsunami ( ; from ja, 津波, lit=harbour wave, ) is a series of waves in a water body caused by the displacement of a large volume of water, generally in an ocean or a large lake. Earthquakes, volcanic eruptions and other underwater exp ...

watch was put into effect by the

Pacific Tsunami Warning Center The Pacific Tsunami Warning Center (PTWC) is one of two tsunami warning centers that are operated by NOAA in the United States. Headquartered on Ford Island, HI, the PTWC is part of an international tsunami warning system (TWS) program and s ...

for Honduras, Guatemala, and Belize and was discontinued 90 minutes after the earthquake occurred.

References

External links

The Magnitude 7.3 Honduras Earthquake May 28, 2009
– ExploringEarth * * {{DEFAULTSORT:2009 Honduras Earthquake 2009 Honduras Honduras

Earthquake An earthquake (also known as a quake, tremor or temblor) is the shaking of the surface of the Earth resulting from a sudden release of energy in the Earth's lithosphere that creates seismic waves. Earthquakes can range in intensity, from ...

May 2009 events in North America 2009 tsunamis

Earthquake

Tsunami

Damage

See also

References

Further reading

External links