Tsunami Information Bulletin

TSUNAMI BULLETIN NUMBER 001
PACIFIC TSUNAMI WARNING CENTER/NOAA/NWS
ISSUED AT 0728Z 24 SEP 2009

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

... TSUNAMI INFORMATION BULLETIN ...

THIS BULLETIN IS FOR INFORMATION ONLY.

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 -  0716Z 24 SEP 2009
 COORDINATES -  19.1 NORTH  107.3 WEST
 DEPTH       -   10 KM
 LOCATION    -  OFF COAST OF JALISCO  MEXICO
 MAGNITUDE   -  6.7

EVALUATION

 NO DESTRUCTIVE WIDESPREAD TSUNAMI THREAT EXISTS BASED ON
 HISTORICAL EARTHQUAKE AND TSUNAMI DATA.

 HOWEVER - EARTHQUAKES OF THIS SIZE SOMETIMES GENERATE LOCAL
 TSUNAMIS THAT CAN BE DESTRUCTIVE ALONG COASTS LOCATED WITHIN
 A HUNDRED KILOMETERS OF THE EARTHQUAKE EPICENTER. AUTHORITIES
 IN THE REGION OF THE EPICENTER SHOULD BE AWARE OF THIS
 POSSIBILITY AND TAKE APPROPRIATE ACTION.

THIS WILL BE THE ONLY BULLETIN ISSUED FOR THIS EVENT UNLESS
ADDITIONAL INFORMATION BECOMES AVAILABLE.

THE WEST COAST/ALASKA TSUNAMI WARNING CENTER WILL ISSUE PRODUCTS
FOR ALASKA...BRITISH COLUMBIA...WASHINGTON...OREGON...CALIFORNIA.
======================

Earthquake Details

Magnitude 6.4
Date-Time
Location 18.992°N, 107.350°W
Depth 35 km (21.7 miles) set by location program
Region OFF THE COAST OF JALISCO, MEXICO
Distances 285 km (175 miles) SW of Puerto Vallarta, Jalisco, Mexico 315 km (195 miles) W of Manzanillo, Colima, Mexico 325 km (200 miles) WSW of Autlan, Jalisco, Mexico 855 km (530 miles) W of MEXICO CITY, D.F., Mexico
Location Uncertainty horizontal +/- 6.5 km (4.0 miles); depth fixed by location program
Parameters NST=256, Nph=256, Dmin=>999 km, Rmss=1.3 sec, Gp= 97°, M-type=teleseismic moment magnitude (Mw), Version=7
Source
  • USGS NEIC (WDCS-D)
Event ID us2009lyat
  • This event has been reviewed by a seismologist.
Posted in Tsunami. 1 Comment »

One Response to “Tsunami Information Bulletin”

  1. mmweather Says:

    No Threat of Tsunami from Mexican Quakes
    THE ASSOCIATED PRESS

    LOS ANGELES — Authorities said Monday there was no tsunami threat to the West Coast and Hawaii following a strong earthquake beneath Mexico’s Gulf of California.

    The temblor, which had a preliminary magnitude of 6.9, struck the Gulf shortly before 11 a.m. Five minutes earlier, a foreshock registering a magnitude-5.8 hit the region, said geophysicist Paul Caruso of the U.S. Geological Survey in Boulder, Colo.

    The main shock was followed half an hour later by two moderate aftershocks with magnitudes of 5.0 and 5.9, according to the USGS Web site.

    Three of the epicenters were under the Gulf waters between the Baja California peninsula and the Mexico mainland. One epicenter was near the peninsula’s eastern coastline.

    The West Coast & Alaska Tsunami Warning Center and Pacific Tsunami Warning Center said no destructive tsunami was expected along the West Coast and Hawaii.

    The quakes were centered between 297 miles and 343 miles south of the California-Mexico border at the boundary where the Pacific and North American plates are pulling apart, said Joann Stock, professor of geology and geophysics at the California Institute of Technology.

    Scientists said some areas where strong shaking occurred may experience local underwater landslides.

    The Gulf of California is home to a zigzag set of earthquake faults and scientists are still trying to figure out where the latest quakes occurred.

    “The fault systems are underwater so they don’t usually cause as much direct damage,” Stock said.

    In 2004 there was a tsunami caused by an earthquake in the Indian Ocean. There were 229,866 casualties, making it the second deadliest earthquake in recorded history.


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