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Posts Tagged ‘Harrat Lunayyir’

Arabia Lucky Last Time

Posted by feww on September 27, 2010

Will Arabia Be So Lucky Next Time?

A swarm of at least 30,000 tremors  that struck Harrat Lunayyir, an ancient  lava field in western Arabia, between April and June 2009 was a ‘failed eruption,’ US and Arabian geologists say.


An aerial view of one of the volcanoes in the Al-Aayiss area.

Based on the ground deformation satellite data, depth and signature of the shockwaves, the researchers have concluded that the seismic activity was related to a ‘failed volcanic eruption.’ They say magma has now moved very  close to the surface, increasing the probability of an eruption.

The Arabian peninsula’s western side comprises lava fields [harrat] measuring up to 200,000 square kilometers, which were formed over the past 30 million years, after Arabia split from Africa.


Fissures formed when the earthquake swarm struck Harrat Lunayyir, western Arabia, between April and June 2009. Image source: Arabian media.  Image may be subject to copyright.

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Posted in volcanic activity, volcanic eruption, volcanism, volcano | Tagged: , , | 1 Comment »

FEWW Saudi Quake Swarm Forecast 100 pct Correct!

Posted by feww on May 20, 2009

FEWW forecast of an earthquake swarm rocking western Saudi Arabia was  100 pct spot on!

Since FEWW Western Arabia earthquake cluster forecast, which was posted on the blog on May 19, 2009, at 10:35am UTC, 4 new seismic events have occurred in the area, measuring between 4.6 and 5.7 Mw. See Map below.

us2009gvba  WSA - 20May 2009
Western Saudi Arabia earthquake cluster location map.
10-degree Map Centered at 25°N,40°E. Source: USGS

FEWW expects further seismic activity in the area which may include a more powerful quake measuring 6.2 Mw.

FEWW also believes there’s a 0.74 probability that Arabia’s Harrat Lunayyir volcanic field could become active by Mid July 2009 [July 17, 2009]  after about 1,000 years of dormancy.

List of 4 latest Earthquakes: (Source: USGS)

Magnitude 4.9

Date-Time Tuesday, May 19, 2009 at 16:54:31 UTC
Location 25.311°N, 37.676°E
us2009gva7

Magnitude: 5.7
Date-Time Tuesday, May 19, 2009 at 17:35:01 UTC
Location 25.353°N, 37.761°E
Event ID us2009gvba

Magnitude 4.6
Date-Time Tuesday, May 19, 2009 at 19:57:18 UTC
Location 25.202°N, 37.737°E
Event ID us2009gvbq

Magnitude 4.6
Date-Time Tuesday, May 19, 2009 at 22:02:21 UTC
Location 0.327°S, 132.577°E
Event ID us2009gvb6

Harrat Lunayyir (Volcanic Field) Western Arabia

  • Region: Western Arabia
  • Volcano Type: Volcanic field
  • Last Known Eruption: 1000 (in or before)
  • Summit Elevation: 1370 m  (4,495 feet)
  • Latitude: 25.17°N  (25°10’0″N)
  • Longitude: 37.75°E  (37°45’0″E)


Harrat Lunayyir is a basaltic volcanic field in NW Saudi Arabia, east of the Red Sea port of Umm Lajj. It contains about 50 volcanic cones that were constructed over Precambrian crystalline rocks along a N-S axis. Harrat Lunayyir is one of the smallest of the Holocene lava fields of Saudi Arabia, but individual flow lobes radiate long distances from the center of the Harrat, and flows reached the Red Sea in two places. Lava flows are basaltic to basanitic in composition, and the Holocene flows are alkali olivine basalts. One of the cones may have erupted around the 10th century AD or earlier. (Caption: GVP). Image: NASA Space Shuttle image STS26-41-61, 1988 (http://eol.jsc.nasa.gov/).

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Posted in earthquake forecast, saudi arabia earthquake, saudi quake, saudi volcano, volcanic eruption | Tagged: , , , , | 4 Comments »

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 »

 
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