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Posts Tagged ‘Santa Isabel’

Strong Quake Strikes Off the Coast Mexico

Posted by feww on September 24, 2009

Magnitude 6.4 Earthquake Strikes Off the Coast of Jalisco,Mexico

Strong earthquake measuring 6.4 Mw struck off SW of Puerto Vallarta, Jalisco, Mexico, at a depth of 35 km, on Thursday,  September 24, 2009, at 07:16 UTC, USGS/EHP reported.

This event will almost certainly affect the outcome of the FEWW northern California earthquake forecast.

The earthquake was preceded by a foreshock measuring 5.6Mw which occurred on Friday,  September 18,  2009, at 18:46 UTC.

FEWW Comments: This earthquake may have primed for eruption either one or both of two volcanoes Bárcena, which forms the island of San Benedicto, and Socorro, located on island of the same name, about 380 km to the west of the EQ location.

10-degree Map Centered at 20°N,105°W

OFF THE COAST OF JALISCO - MEXICO
EQ Location Map. Source: USGS

This Earthquake:

  • Magnitude: 6.4
  • Date/Time: Thursday, September 24, 2009 at 07:16:24 UTC [Thursday, September 24, 2009 at 12:16:24 AM at epicenter]
  • Location: 18.992°N, 107.350°W
  • Depth: 35 km (21.7 miles)
  • 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)
  • Source: USGS NEIC (WDCS-D)
  • Event ID: us2009lyat

The associated Press quoted the USGS as follows:

The U.S. Geological survey says the temblor struck about 170 miles (275 kilometers) southwest of Puerto Vallarta at 0716 GMT (3:16 a.m. EDT) Thursday. It occurred at a depth of about 2.5 miles (4 kilometers).

Tsunami Bulletin:

PACIFIC TSUNAMI WARNING CENTER/NOAA/NWS
Issued the following at 07:28UTC 24 SEP 2009

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.

Related Links:


Posted in baja calif, Baja peninsula, Colima earthquake, Jalisco foreshock, Manzanillo earthquake, Mexico City | Tagged: , , , , , , , , | 1 Comment »

Magnitude 6.9 Quake Strikes Gulf of California

Posted by feww on August 3, 2009

Details of April 4, 2010 quake in BAJA posted at

M7.3 Quake Hits Baja

A powerful earthquake measuring 6.9Mw and strong fore- and aftershocks rock Baja, California

A strong earthquake measuring 6.9Mw struck Gulf of California Monday, August 03, 2009 at 17:59:56 UTC, USGS reported.

The M6.9 mainshock was preceded by a 5.8Mw foreshock and followed by two aftershocks measuring 5.0 and 5.9Mw.

More aftershocks are almost certain to follow.

AP reported:

Phoenix Fire Department spokesman Alex Rangel said a high-rise near downtown shook violently enough that workers evacuated, but there were no reports of injuries or damage. The quake was centered about 460 miles (740 kilometers) from Phoenix.

Earthquake Details [Mainshock]

  • Magnitude: 6.9
  • Date-Time:
    • Monday, August 03, 2009 at 17:59:56 UTC
    • Monday, August 03, 2009 at 10:59:56 AM at epicenter
  • Location: 29.066°N, 112.871°W
  • Depth: 10 km (6.2 miles) set by location program
  • Region: GULF OF CALIFORNIA
  • Distances
    • 89 km (56 miles) NNE (31°) from Santa Isabel, Baja California, Mexico
    • 137 km (85 miles) W (280°) from La Doce, Sonora, Mexico
    • 174 km (108 miles) NE (46°) from Guerrero Negro, Baja California Sur, Mexico
    • 185 km (115 miles) W (270°) from Hermosillo, Sonora, Mexico
    • 553 km (343 miles) SE (133°) from Tijuana, Baja California, Mexico
  • Location Uncertainty: horizontal +/- 7.1 km (4.4 miles); depth fixed by location program
  • Parameters:  NST=140, Nph=140, Dmin=411.8 km, Rmss=1.31 sec, Gp= 97°, M-type=teleseismic moment magnitude (Mw), Version=7
  • Source: USGS NEIC (WDCS-D)
  • Event ID:  us2009jwbh

10-degree Map Centered at 30°N,115°W

us2009jwbh Gulf of Calif
Earthquake Location Map. USGS

Seismic Hazard Map

us2009jwbh Gulf of Calif  Seismic Hazard Map
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green. USGS

Historic Seismicity us2009jwbh
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green. USGS

Related Links:

Posted in Earthquakes, La Doce Sonora, Seismic Hazard, Seismic report | Tagged: , , , , | 5 Comments »