カリフォルニア 群発地震 〜 California Earthquake Swarm （英語名称） 〜 続報
◆Southern California town declares emergency over quake swarm
REUTERS, LOS ANGELES | Wed Aug 29, 2012 8:44pm EDT
地震発生のメカニズムに興味があるのでしばらく追いかけることに；
先日紹介の様に、 ”California’s earthquake ’swarm’ unusual but not rare” と云うことらしいが、今回の群発 "swarm" は過去３０年間で最強との報道もあります；
◆Report: So. Calif. quake swarm strongest in 30 years
6:41 AM, Aug 28, 2012, news10.net
当然様々な憶測が乱れ飛んで？ おり、動画など題名を観ているだけでも面白い； "Warning !" やら "Be prepared !" は勿論、 "7.3 earthquake El Salvador, southern California earthquake swarm Jesus is near!" とか "Illuminati Freemason Haarp Tested near Brawley California. 33 degree Parallels.Earthquake Swarm " 、 "Mysterious CALIFORNIA APOCALYPTIC BOOMS - Before 5.5 EARTHQUAKE Aug. 22, 2012 Lost" など、発信者も様々。
今回の群発地震は、サンアンドレアス断層とインペリアル断層地帯を結ぶブラウリー地震地帯特有のもの、との観方が今のところ一般的？
■ August 2012 Brawley, California Earthquake Swarm
Version 2 - 5:00PM 8/26/2012, USGS
■ August 2012 Brawley Earthquake Swarm
Version 3 - 12:00PM 8/27/2012, SCSN.org - Southern California Seismic Network.htm
出典： Map / USGS
⇒ Brawley Seismic ZoneBrawley Seismic Zone
⇒ Imperial Fault Zone - Wikipedia
⇒ San Andreas Fault - Wikipedia
以下は少し違った観方？
◆Scientists Study Earthquake Swarm Hitting Southern California
August 28, 2012 — 8:10 AM, KQED News
−−−Earthquake swarms happen in places where there’s hydrothermal activity - hot water moving under the Earth’s crust. "That would explain why you don’t just have one main shock. You have constantly moving fluids that can be constantly triggering earthquakes," says USGS seismologist Jeanne Hardebeck.
Earthquake swarms also happen in an area called the Geysers, 75 miles north of San Francisco. USGS hopes this swarm outside of the town of Brawley will help them understand how earthquake swarms work. "Some of the earthquakes in the swarm are triggering other earthquakes in the swarm and we’d really like to understand better how that happens," says Hardeback. （以下略、引用終わり）
※ 引用２つ目のパラグラフの Geysers （間欠泉のこと） とは Old Faithful Geyser of California のことでしょう。
ブラウリー付近の地図を見ると；
出典： California Integrated Seismic Network 資料
