Caribbean Earthquake Model

Dec 22, 2006

Researchers at the University of Arkansas and Purdue University have monitored tiny tectonic movements in the Caribbean to create the first comprehensive and quantitative kinematic model describing potential earthquake activity in the region.

University of Arkansas researchers Pamela Jansma and Glen Mattioli, together with Purdue University researchers D. Manaker and Eric Calais, presented their findings at the fall meeting of the American Geophysical Union.

Several large earthquakes have struck the Caribbean region in the past 500 years in the vicinity of Puerto Rico, the U.S. Virgin Islands and the island of Hispaniola, shared by Haiti and the Dominican Republic. Millions of residents live in the Caribbean Islands, so a better understanding of the likely location of earthquakes could help people better prepare for the possibility.

For the past 12 years, Jansma and Mattioli have used global positioning satellite geodesy to monitor very small movements along the tectonic plates in the Caribbean basin to determine the relative motion between the Caribbean and the North American plates. Caribbean plate boundaries are interesting because the plates move extremely slowly - about 2 centimeters a year - making the region an important part of the global picture of how plates interact.

"We have to wait a long time to see results with the GPS," Jansma said.

After 12 years of gathering data, the researchers felt they had enough information to build a preliminary model. In doing so, they try to build a model that explains the movement along the plate interface to see if there is sticking going on between the two plates.

"If the plates are stuck and not moving past each other smoothly, at some time they will break, and if they break, it will release a lot of energy" in the form of an earthquake, Mattioli said.

The model contains data on the slip rates of the main faults and strain accumulation at various sites, based both on GPS sites and geological evidence. It also includes information on the locked zone of the faults - the depth on the fault that is partially stuck-- and the location of known fault boundaries.

The researchers found that coupling, or sticking, was low in Puerto Rico and the Virgin Islands, but was much higher in the Dominican Republic, Haiti and Hispaniola, which implies an elevated risk of earthquakes in that region.

"This result isn't surprising if you look at the geomorphology of the region," Jansma said. The Dominican Republic is more mountainous than Puerto Rico, implying more deformation.

The next step will be to refine the model using more data gathered from the region over time.

"Regional models like these show you where the important data holes are. They make predictions about where you should put additional sites," Jansma said.

The next version of the model will include new data collected in 2006 and 2007 and should be better still.

Source: University of Arkansas

Explore further: NASA sees Typhoon Matmo making second landfall in China

add to favorites email to friend print save as pdf

Related Stories

After Haiti, Worries About Other Big Quakes

Jan 18, 2010

In the last several days, while the attention of the world has been focused on the human toll of Tuesday's earthquake in Haiti, scientists have begun to look at the quake's geological toll. What is the danger ...

Why do the Caribbean Islands arc?

Aug 20, 2012

(Phys.org) -- The Caribbean islands have been pushed east over the last 50 million years, driven by the movement of the Earth's viscous mantle against the more rooted South American continent, reveals new ...

Slow slip and slide dynamics

Mar 05, 2008

Kim Psencik, a Ph.D. student in the division of marine geology and geophysics at the University of Miami (UM) Rosenstiel School of Marine and Atmospheric Science, was recently awarded the prestigious MARGINS Student Prize ...

Recommended for you

Fires in Central Africa During July 2014

14 minutes ago

Hundreds of fires covered central Africa in mid-July 2014, as the annual fire season continues across the region. Multiple red hotspots, which indicate areas of increased temperatures, are heavily sprinkled ...

NASA's HS3 mission spotlight: The HIRAD instrument

10 hours ago

The Hurricane Imaging Radiometer, known as HIRAD, will fly aboard one of two unmanned Global Hawk aircraft during NASA's Hurricane Severe Storm Sentinel or HS3 mission from Wallops beginning August 26 through ...

Fires in the Northern Territories July 2014

23 hours ago

Environment Canada has issued a high health risk warning for Yellowknife and surrounding area because of heavy smoke in the region due to forest fires. In the image taken by the Aqua satellite, the smoke ...

How much magma is hiding beneath our feet?

Jul 23, 2014

Molten rock (or magma) has a strong influence on our planet and its inhabitants, causing destructive volcanic eruptions and generating some of the giant mineral deposits. Our understanding of these phenomena ...

User comments : 0