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Article: The quake gap: waiting for magnitude 7. (Chalfant Valley, California)
- Article from:
- Science News
- Article date:
- August 2, 1986
- Author:
CopyrightCOPYRIGHT 1986 Science Service, Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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The quake gap: Waiting for magnitude 7
The aftershocks grew progressively weaker during the five days following eastern California's 6.1 magnitude earthquake on July 21 -- signaling an end to the week-long swarm of seismic activity in the Chalfant Valley. Besides the main shock, there had been three quakes above magnitude 5 -- a 5.5 magnitude foreshock and 5.2 and 5.1 magnitude aftershocks. (According to seismologists, none was related to the 5.9 magnitude quake that struck near Palm Springs on July 8 or the 5.3 quake that hit the ocean near Oceanside on July 13.)
Now, the Chalfant Valley might remain quiet for weeks, months or even years. But before ...