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Archive for the ‘Subduction Zones’ Category

Strong Earthquake Strikes Offshore N Venezuela

Posted by feww on September 13, 2009

Magnitude 6.4 Quake Strikes Offshore Aragua, Northern Venezuela

An earthquake measuring 6.4 Mw struck offshore Aragua, northern Venezuela about 100 km west of Caracas, the Venezuelan capital at a depth of 10 km on Saturday, September 12, 2009 at 20:06 UTC, according to USGS/EHP.

NOAA/NWS/West Coast and Alaska Tsunami Warning Center issue the following Tsunami Information Statement on 09/12/2009 at 4:15PM AST:

A strong earthquake has occurred, but a tsunami IS NOT expected along the coasts of Puerto Rico, the Virgin Islands, U.S. Atlantic and Gulf of Mexico states, and Eastern Canadian provinces. NO tsunami warning, watch or advisory is in effect for these areas.

Based on the earthquake location, magnitude, and historic tsunami records, a damaging tsunami IS NOT expected along the Puerto Rico, Virgin Islands, U.S. Atlantic, Eastern Canadian and Gulf of Mexico coasts.

USGS/EHP had again downgraded their original reading from 7.0 to 6.4Mw.

Venezuelan Interior Minister reported that two people had received major leg injuries, with 12 others suffering less serious injuries as a result of the damage caused by the quake.

Venezuela’s emergency services chief, Luis Diaz Curbelo, reportedly said the quake was felt across the country.

At least seven people were injured and several buildings were damaged in the NW state of Falcon, the worst hit area, he said.

Another report  said the parts of the capital and several other regions were left without electricity.

10-degree Map Centered at 10°N,70°W

venezuela 12-09-09
Earthquake Location. Source of Original map: USGS

Seismic Hazard Map

venezuela  Seismic Hazard Map
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green

Historic Seismicity

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

Earthquake details

  • Magnitude: 6.4
  • Date-Time:
  • Saturday, September 12, 2009 at 20:06:25 UTC [ Saturday, September 12, 2009 at 08:06:25 PM at epicenter]
  • Location: 10.757°N, 67.847°W
  • Depth: 10 km (6.2 miles)
  • Distances:
    • 35 km (25 miles) NNE of Puerto Cabello, Venezuela
    • 60 km (35 miles) NNE of Valencia, Venezuela
    • 100 km (65 miles) W of CARACAS, Venezuela
    • 2115 km (1310 miles) SE of Miami, Florida
  • Location Uncertainty: horizontal +/- 5.4 km (3.4 miles);
  • Parameters:  NST=197, Nph=197, Dmin=806.2 km, Rmss=1.12 sec, Gp= 36°, M-type=teleseismic moment magnitude (Mw), Version=7
  • Source: USGS NEIC (WDCS-D)
  • Event ID: us2009llbc

Posted in oil refinery, opec port, seismic activity report, Subduction Zones, Tectonic Boundaries, Transform Faults | Tagged: , , , , , , , , | Leave a Comment »

Magnitude 6.1 quake strikes southern Peru

Posted by feww on July 12, 2009

A strong magnitude 6.1 earthquake struck southern Peru Sunday

U.S. Geological Survey reported a  magnitude 6.1 earthquake in southern Peru early Sunday. The quake epicenter was located about 60 km NNW of Juliaca, Peru, some 785 km  ESE of the capital city of  Lima.

There were no immediate reports of structural damage or injuries caused by the quake, which struck at a depth of about 200km.

10-degree Map Centered at 15°S,70°W

peru - us2009izaj
Earthquake Location. Source: USGS

Earthquake Details:

  • Magnitude: 6.1
  • Date-Time:
    • Sunday, July 12, 2009 at 06:12:47 UTC
    • Sunday, July 12, 2009 at 01:12:47 AM at epicenter
  • Location: 14.990°S, 70.421°W
  • Depth:  201.6 km (125.3 miles) set by location program
  • Region:  SOUTHERN PERU
  • Distances:
    • 60 km (40 miles) NNW of Juliaca, Peru
    • 200 km (125 miles) NE of Arequipa, Peru
    • 230 km (145 miles) SE of Cuzco, Peru
    • 785 km (485 miles) ESE of LIMA, Peru
  • Location Uncertainty:  horizontal +/- 7.4 km (4.6 miles); depth fixed by location program
  • Parameters NST=263, Nph=263, Dmin=284.6 km, Rmss=1.19 sec, Gp= 29°, M-type=teleseismic moment magnitude (Mw), Version=8
  • Source: USGS NEIC (WDCS-D)
  • Event ID:  us2009izaj

Other Maps:

Historic Seismicity  (mag 7 and 8+ since 1900)


Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green

Seismic Hazard Map

Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green

Related Links:

    Posted in Chile Ridge, Nazca Plate, Pacific Ring of Fire, peru-chile trench, Subduction Zones | Tagged: , , , , | 1 Comment »