{"id":263,"date":"2015-05-15T02:01:46","date_gmt":"2015-05-15T02:01:46","guid":{"rendered":"https:\/\/tungsten2.gps.caltech.edu\/?page_id=263"},"modified":"2016-09-12T21:30:49","modified_gmt":"2016-09-12T21:30:49","slug":"19980306-m5-2-coso-junction","status":"publish","type":"page","link":"https:\/\/www.scsn.org\/index.php\/earthquakes\/speqrep\/19980306-m5-2-coso-junction\/","title":{"rendered":"1998\/03\/06 M5.2 Coso Junction"},"content":{"rendered":"

The largest earthquake in southern California since March 1997 occurred on Thursday night, March 5, at 9:47 p.m. PST. It was a magnitude 5.2 earthquake located in the Owens Valley, 17 east-northeast of the small town of Little Lake. It was located just 2 km east of a M5.3 earthquake that occurred on Thanksgiving 1996. Both earthquakes are near the Coso geothermal area (see map).<\/p>\n

The Owens Valley is an extensional regime, but the predominant focal mechanisms are strike-slip. This earthquake is also strike slip with planes striking northwest and northeast. The aftershocks strike northeast, suggesting that the causative fault is left-lateral strike-slip on the northeast-striking plane.<\/p>\n

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As of 2:30 p.m. on Friday March 6, SCSN\/TriNet (the Southern California Seismic Network component of TriNet) had recorded 164 aftershocks to this earthquake. The largest 3 are M4.8 at 9:49, M4.6 at 9:54 p.m., and M4.5 at 11:36 p.m. The aftershocks are decaying as we usually see for aftershock sequences. At the present rate, the probability of another earthquake of magnitude 5 or larger in the next week is about 1 in 8.<\/p>\n

March 9, 1998 update on the Coso sequence<\/h5>\n

As of 2:30 pm, SCSN\/TriNet has recorded 495 earthquakes in the Coso sequence. A second magnitude 5+ earthquake (M5.1) did occur, at 4:36 pm PST on Friday March 6. The sequence is decaying as expected. The number of M1.5 and greater earthquakes recorded by SCSN\/TriNet increased after each M5+ event and decayed approximately as 1\/t. In the first few hours after each M5, the rate of earthquakes is high enough that not all of the smaller earthquakes can be seen.<\/p>\n

The spatial distribution of earthquakes indicates a northeast-striking fault with a slight dip to the northeast. This is consistent with the focal mechanisms of the earthquakes.<\/p>\n

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\n<\/figure>\n","protected":false},"excerpt":{"rendered":"

The largest earthquake in southern California since March 1997 occurred on Thursday night, March 5, at 9:47 p.m. PST. It was a magnitude 5.2 earthquake located in the Owens Valley, 17 east-northeast of the small town of Little Lake. It…<\/span><\/p>\n

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