Fire Earth

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Posts Tagged ‘seismic events’

Saudi Quakes Oil Drilling Activity Related?

Posted by feww on May 19, 2009

Two Quakes Strike Arabia

A Large Swarm of Earthquakes May Follow

Two quakes measuring 4.6 and 4.9 struck Saudi Arabia on Sunday and Tuesday receptively. The two seismic events may be followed by a large swarm of earthquakes in the coming days.

Moderators are watching the events with interest because the quakes are concentrated close to Harrat Lunayyir, a basaltic volcanic field located in NW Saudi Arabia with some 50 volcanic cones. According to USGS record, “Harrat Lunayyir is one of the smallest of the Holocene lava fields of Saudi Arabia,” which last erupted about 1,000 years ago.

FEWW is carefully analyzing the likelihood whether the quakes were caused by petroleum drilling activity, and will post its findings soon.

us2009gvaj -1 arabia

Earthquake Details:

Magnitude: 4.9
Date-Time:

  • Tuesday, May 19, 2009 at 06:38:33 UTC
  • Tuesday, May 19, 2009 at 09:38:33 AM at epicenter

Location: 25.105°N, 37.788°E
Depth: 10 km (6.2 miles) set by location program
Region: WESTERN SAUDI ARABIA
Distances:

  • 115 km (70 miles) NNW of Yanbu` al Bahr, Saudi Arabia
  • 185 km (115 miles) SE of Al Wajh, Saudi Arabia
  • 195 km (120 miles) WNW of Al Madinah, Saudi Arabia
  • 915 km (560 miles) W of RIYADH, Saudi Arabia

Location Uncertainty: horizontal +/- 12.6 km (7.8 miles); depth fixed by location program
Parameters:  NST= 20, Nph= 20, Dmin=>999 km, Rmss=0.86 sec, Gp=155°, M-type=body wave magnitude (Mb), Version=7
Source: USGS NEIC (WDCS-D)
Event ID:  us2009gvaj

Earthquake Details:

Magnitude:  4.6
Date-Time:

  • Sunday, May 17, 2009 at 19:50:07 UTC
  • Sunday, May 17, 2009 at 10:50:07 PM at epicenter
  • Time of Earthquake in other Time Zones

Location: 25.356°N, 37.632°E
Depth: 10 km (6.2 miles) set by location program
Region WESTERN SAUDI ARABIA
Distances:

  • 145 km (90 miles) NNW of Yanbu` al Bahr, Saudi Arabia
  • 155 km (95 miles) SE of Al Wajh, Saudi Arabia
  • 220 km (135 miles) WNW of Al Madinah, Saudi Arabia
  • 930 km (570 miles) W of RIYADH, Saudi Arabia

Location Uncertainty:  horizontal +/- 12 km (7.5 miles); depth fixed by location program
Parameters: NST= 21, Nph= 21, Dmin=546.8 km, Rmss=0.81 sec, Gp=144°, M-type=body wave magnitude (Mb), Version=7

Source: USGS NEIC (WDCS-D)

Event ID:  us2009gtbi

Posted in Al Madinah, Al Wajh, Desert Volcano, Riyadh, WESTERN SAUDI ARABIA | Tagged: , , , , | 4 Comments »

Redoubt could explode at any time

Posted by feww on May 6, 2009

Redoubt Activity – Color Code ORANGE : Alert Level WATCH

Latest update from AVO:

An explosive event could occur at any time with little warning

Local time: May 06, 2009 0525 AKDT (May 06, 2009 1325 UTC)

2009-05-06 04:23:52
Seismic activity remains unchanged over the last 2 hours. Repeating seismic events continue. It is possible that an explosive event could occur at any time with little warning. Weather clouds have dissipated near the volcano. The volcano is once again visible from the Hut netcam, and has occasionally revealed glowing spots related to rockfalls from the growing dome.


Image of Redoubt’s dome and summit area, taken during gas / observation flight on May 4, 2009. Image Creator: Keith Labay ; Image courtesy of AVO/USGS.


View of the north flank of Redoubt Volcano from the research hut where one of the webcams is situated. This zoomed image shows a minor block-and-ash flow advancing down the talus slope below the dome produced from hot debris shed off the dome. Hot debris collects in the gorge above the waterfall generating minor, secondary steam/ash clouds. Picture Date: April 30, 2009 14:14:39 AKDT –  Image Creator: Game McGimsey -Image courtesy of AVO/USGS.


View of the growing lava dome during gas and observation flight on May 4, 2009. Note the tongue of blocky lava extending down the upper Drift gorge. A lighter gray slope of talus – rocky debris shed off the slowly advancing tongue of lava – fills the gorge downslope, nearly reaching the muddy waterfall. Small plumes of ash rise from rockfalls. Note the vigorously steaming margins of the dome, possibly caused by interaction of hot rock and water accumulating from melting snow and ice in the summit crater. Colleague Rick Wessels used a shortwave infrared (SWIR) image captured by a nighttime pass of Landsat 7 to show the dimensions of the dome – about 510 x 760 m (1700 feet x 2500 feet) and at least 150 m (500 feet) high. See image below. Picture Date: May 04, 2009 AKDT – Image Creator: Christina Neal – Image courtesy of AVO/USGS.


Shortwave infrared (SWIR) image of the warm dome areas captured by a nighttime pass of Landsat 7 on May 02, 2009. The hot dome pixels have been placed over a WorldView image from April 16, 2009 and a topographic map from 1990. The SWIR image shows a hot central vent as well as areas of active rockfalls along the perimeter.

Picture Date: May 02, 2009 07:12:54 UTC  –  Image Creator: Rick Wessels – Image montage produced by AVO/USGS. Landsat data courtesy of USGS Earth Resources Observation and Science (EROS). WorldView Data, Digital Globe, Inc (copyright 2009)


Redoubt Volcano active lava dome taken from the north The top image is an oblique airphoto by Game McGimsey while the bottom shows the FLIR thermal image. Picture Date: April 16, 2009 12:48:50 AKDT – Image Creator: Rick Wessels – Image courtesy of AVO/USGS.

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Posted in Alaska volcanoes, explosive event, lava flow, oil terminal, redoubt ashfall | Tagged: , , , , | Leave a Comment »