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Earthquake Magnitude 7.6 - 10km NE of Hojancha, Costa Rica-tsunami alert cancelled

Shiloh

Shiloh

Editor, Senior Moderator
Source: http://earthquake.usgs.gov/earthquakes/eventpage/usc000cfsd#summary

M7.6 - 10km NE of Hojancha, Costa Rica 2012-09-05 14:42:10 UTC
PAGER - GREEN ShakeMap - VI DYFI? - VII Tsunami Warning Center
Earthquake location 10.120?N, 85.347?W
Google Earth KML
Summary
Location and Magnitude contributed by: USGS, NEIC, Golden, Colorado (and predecessors)
General
50 km
20 mi
Powered by Leaflet
Costa Rica
10.120?N, 85.347?W
Depth: 40.8km (25.4mi)
Event Time

2012-09-05 14:42:10 UTC
2012-09-05 08:42:10 UTC-06:00 at epicenter
2012-09-05 10:42:10 UTC-04:00 system time

Nearby Cities

10km (6mi) NE of Hojancha, Costa Rica
11km (7mi) ESE of Nicoya, Costa Rica
30km (19mi) ESE of Santa Cruz, Costa Rica
44km (27mi) SW of Canas, Costa Rica
140km (87mi) W of San Jose, Costa Rica
 
Re: Earthquake Magnitude 7.6 - 10km NE of Hojancha, Costa Rica-tsunami alert

Re: Earthquake Magnitude 7.6 - 10km NE of Hojancha, Costa Rica-tsunami alert

Source: http://ptwc.weather.gov/ptwc/text.php?id=pacific.TSUPAC.2012.09.05.1525


TSUNAMI BULLETIN NUMBER 002
PACIFIC TSUNAMI WARNING CENTER/NOAA/NWS
ISSUED AT 1525Z 05 SEP 2012

THIS BULLETIN APPLIES TO AREAS WITHIN AND BORDERING THE PACIFIC
OCEAN AND ADJACENT SEAS...EXCEPT ALASKA...BRITISH COLUMBIA...
WASHINGTON...OREGON AND CALIFORNIA.

THE EARTHQUAKE MAGNITUDE IS REDUCED TO 7.6
THE WARNING AREA IS REDUCED...SO THE WARNING IS CANCELLED FOR
EL SALVADOR...HONDURAS...MEXICO...COLOMBIA...ECUADOR...
GUATEMALA AND PERU.

... A TSUNAMI WARNING IS IN EFFECT ...

A TSUNAMI WARNING IS IN EFFECT FOR

COSTA RICA / PANAMA / NICARAGUA

FOR ALL OTHER AREAS COVERED BY THIS BULLETIN... IT IS FOR
INFORMATION ONLY AT THIS TIME.

THIS BULLETIN IS ISSUED AS ADVICE TO GOVERNMENT AGENCIES. ONLY
NATIONAL AND LOCAL GOVERNMENT AGENCIES HAVE THE AUTHORITY TO MAKE
DECISIONS REGARDING THE OFFICIAL STATE OF ALERT IN THEIR AREA AND
ANY ACTIONS TO BE TAKEN IN RESPONSE.

AN EARTHQUAKE HAS OCCURRED WITH THESE PRELIMINARY PARAMETERS

ORIGIN TIME - 1442Z 05 SEP 2012
COORDINATES - 9.9 NORTH 85.5 WEST
DEPTH - 46 KM
LOCATION - OFF COAST OF COSTA RICA
MAGNITUDE - 7.6

EVALUATION

IT IS NOT KNOWN THAT A TSUNAMI WAS GENERATED. THIS WARNING IS
BASED ONLY ON THE EARTHQUAKE EVALUATION. AN EARTHQUAKE OF THIS
SIZE HAS THE POTENTIAL TO GENERATE A DESTRUCTIVE TSUNAMI THAT CAN
STRIKE COASTLINES IN THE REGION NEAR THE EPICENTER WITHIN MINUTES
TO HOURS. AUTHORITIES IN THE REGION SHOULD TAKE APPROPRIATE
ACTION IN RESPONSE TO THIS POSSIBILITY. THIS CENTER WILL MONITOR
SEA LEVEL GAUGES NEAREST THE REGION AND REPORT IF ANY TSUNAMI
WAVE ACTIVITY IS OBSERVED. THE WARNING WILL NOT EXPAND TO OTHER
AREAS OF THE PACIFIC UNLESS ADDITIONAL DATA ARE RECEIVED TO
WARRANT SUCH AN EXPANSION.

ESTIMATED INITIAL TSUNAMI WAVE ARRIVAL TIMES AT FORECAST POINTS
WITHIN THE WARNING AND WATCH AREAS ARE GIVEN BELOW. ACTUAL
ARRIVAL TIMES MAY DIFFER AND THE INITIAL WAVE MAY NOT BE THE
LARGEST. A TSUNAMI IS A SERIES OF WAVES AND THE TIME BETWEEN
SUCCESSIVE WAVES CAN BE FIVE MINUTES TO ONE HOUR.

LOCATION FORECAST POINT COORDINATES ARRIVAL TIME
-------------------------------- ------------ ------------
COSTA RICA CABO_SAN_ELENA 10.9N 274.0E 1510Z 05 SEP
CABO_MATAPALO 8.4N 276.7E 1518Z 05 SEP
PUERTO_QUEPOS 9.4N 275.8E 1536Z 05 SEP
PANAMA PUNTA_BURICA 8.0N 277.1E 1527Z 05 SEP
PUNTA_MALA 7.5N 280.0E 1615Z 05 SEP
PUERTO_PINA 7.4N 282.0E 1631Z 05 SEP
BALBOA_HTS. 9.0N 280.4E 1742Z 05 SEP
NICARAGUA SAN_JUAN_DL_SUR 11.2N 274.1E 1531Z 05 SEP
CORINTO 12.5N 272.8E 1546Z 05 SEP
PUERTO_SANDINO 12.2N 273.2E 1550Z 05 SEP

BULLETINS WILL BE ISSUED HOURLY OR SOONER IF CONDITIONS WARRANT.
THE TSUNAMI WARNING WILL REMAIN IN EFFECT UNTIL FURTHER NOTICE.

THE WEST COAST/ALASKA TSUNAMI WARNING CENTER WILL ISSUE PRODUCTS
FOR ALASKA...BRITISH COLUMBIA...WASHINGTON...OREGON...CALIFORNIA.
 
Re: Earthquake Magnitude 7.6 - 10km NE of Hojancha, Costa Rica-tsunami alert

Re: Earthquake Magnitude 7.6 - 10km NE of Hojancha, Costa Rica-tsunami alert

All tsunami warnings have been lifted. See message from PTWC at http://ptwc.weather.gov/?region=1&id=pacific.TSUPAC.2012.09.05.1702.

The Red Cross is reporting 2 deaths so far in Costa Rica but there are still people unaccounted for, according to the NBC News Blog. That blog also includes video of the earthquake as it happened.
 
Re: Earthquake Magnitude 7.6 - 10km NE of Hojancha, Costa Rica-tsunami alert cancelled

http://earthquake.usgs.gov/earthquakes/eventpage/usc000cfsd#summary

M7.6 - 10km NE of Hojancha, Costa Rica 2012-09-05 14:42:10 UTC

PAGER - YELLOW ShakeMap - VII DYFI? - IX
Google Earth KML

Summary

Location and Magnitude contributed by: USGS, NEIC, Golden, Colorado (and predecessors)
General


Costa Rica
10.120?N, 85.347?W
Depth: 40.8km (25.4mi)


Event Time

  1. 2012-09-05 14:42:10 UTC
  2. 2012-09-05 08:42:10 UTC-06:00 <abbr title="Time where earthquake occured">at epicenter</abbr>
  3. 2012-09-05 07:42:10 UTC-07:00 <abbr title="Timezone your computer is configured to use">system time</abbr>

Nearby Cities


  1. 10km (6mi) NE of Hojancha, Costa Rica
  2. 11km (7mi) ESE of Nicoya, Costa Rica
  3. 30km (19mi) ESE of Santa Cruz, Costa Rica
  4. 44km (27mi) SW of Canas, Costa Rica
  5. 140km (87mi) W of San Jose, Costa Rica

Related Links





Tectonic Summary

The September 5th 2012 M 7.6 earthquake beneath the Nicoya Peninsula, Costa Rica, occurred as the result of thrust faulting on or near the subduction zone interface between the Cocos and Caribbean plates. At the latitude of this earthquake, the Cocos plate moves north-northeast with respect to the Caribbean plate at a velocity of approximately 77 mm/yr, and subducts beneath Central America at the Middle America Trench.
Over the past 40 years, the region within 250 km of the September 5th earthquake has experienced approximately 30 earthquakes with M 6 or greater; two of these were larger than M 7, and neither caused documented fatalities. The first was a M 7.2 in August of 1978, 9 km to the north-northeast of the September 5th 2012 event; the second had a magnitude of M 7.3, and struck a region just over 50 km to the east-southeast in March 1990. The earthquake of October 5, 1950, M 7.8, occurred in the general area of the September 5th 2012 earthquake, although the hypocenter of the earlier earthquake is not known to high precision. The 1950 earthquake caused damage in northwestern Costa Rica and in the Valle Central of Costa Rica, but no reported casualties. The closest earthquake to cause fatalities in recent history was the M 6.5 April 1973 earthquake approximately 80 km to the northeast, which resulted in 26 fatalities and over 100 injuries.



Additional Data Contributors


 
Re: Earthquake Magnitude 7.6 - 10km NE of Hojancha, Costa Rica-tsunami alert cancelled

Costa Rica escapes serious damage from big quake

By Danica Coto, Associated Press
Updated 20m ago

...Costa Rica suffered remarkably little damage from Wednesday's magnitude-7.6 quake ? a few blocked highways, some collapsed houses and one death, of a heart attack caused by fright. Officials credited the relatively deep location of the quake and building codes that Costa Rican officials call as strict as those in California and Japan.

The quake was 25 miles below the surface. Tremors that occur deep underground tend to be less damaging, but their shaking can be felt over a wider area.

"If it was a shallower event, it would be a significantly higher hazard," said seismologist Daniel McNamara of the U.S. Geological Survey.
...
"We have a culture of concrete and steel," he told the Associated Press.

"Years ago we abandoned building in mud and adobe, something that's caused a lot of problems and that they're continuing in other countries."
Costa Rica's anti-earthquake structural codes have been updated in line with the latest international standards three times since they were enacted in 1974, most recently last year.
...
Officials said the quake collapsed some houses and at least one bridge and caused landslides that blocked highways. But Costa Rica President Laura Chinchilla said there were no reports of major damage.

...
Full text+video:
http://www.usatoday.com/news/world/story/2012-09-06/costa-rica-earthquake/57628602/1?csp=34news
 
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