Send this page to a friend



Sunday 18 January 2009, San José, Costa Rica

Tremors Subside But We Must Not Lower Our Guard
Many Fear Of Another Major Earthquake
Families Of Missing Ask For Continuation of Recovery Efforts
New "Official Map of Costa Rica" In the Works
Festival Kicks of In Santa Cruz

Many Fear Of Another Major Earthquake
The fear by many is the possibility of a second major earthquake or "terremoto gemelo" is explained by a geologist for the Red Sismológica Nacional (RSN).

The Spanish language daily reported earlier this week explained the history of "terremoto gemelos" (twin earthquakes) in the country.

The terremoto gemelos, according to Guillermo Alvarado, geologist for the Red Sismológica Nacional (RSN) of the Universidad de Costa Rica (UCR) and the Instituto Costarricense de Electricidad (ICE), are when two earthquakes have the same destructive power within a close period of time.

Alvarado explained the destruction of Cartago, east of San José, in 1842 when two destructive earthquakes hit the area six months apart. And the earthquake of 1920, also in Cartago, that occurred 21 days apart.

In 1911 and 1912 the earthquakes of the Toro Amarillo were spaced at 10 months apart. And the earthquake of December 22, 1990, in Alajuela was followed up by another seven months later in Puriscal, on the south side of Alajuela.

Alvarado was quick to say that that is the history of terremoto gemelos in the country and does not mean such will be the case this time, but did not discard the possibility either.

The geologist explained that when one local fault, as the case of the January 8 earthquak, it releases energy and activates other local faults. In Costa Rica there are some 1.000 local faults, but only 150 are of grave concern and can unleash tremendous destruction.

Alvarado went further in his explanation, saying that that is the case in the earthquake of January 8 with the epicentre in Cinchona, it activated the fault in the area of the Poás volcano and responsible for the tremors with the epicentre in the area of Bajos de Toro Amarillo and the Horquetas de Sarapiquí.

According to data by the RSN in the 19th and 20th century, Costa Rica has suffered a total of 48 earthquakes, one every four years, on average.

27 of the earthquakes were caused by subduction or shocks between tectonic plates, the last being in the area of Damas, near Quepos, in 2004.





Advertise With Us | Subscribe To Our Newsletter | Archives | Search | About Us Online Shop | Learn Spanish | Photo Gallery |  Links
2133-1000 San José, Costa Rica  E-Mail: [email protected]  Telephone: (506) 8845 5800  / (506) 2231 3205  Fax: (506) 2232 6337
©2008  INSIDECOSTARICA.COM  All rights reserved.
Privacy Policy For more information on this website contact: [email protected]
Website Design, Hosting & Maintenance by: iStarmedia Internet Solutions