Related Earthquakes
The quake was preceded by the 6.1 magnitude Joshua Tree earthquake on April 23, which was located to the south of the future Landers epicenter. The 6.5 magnitude Big Bear earthquake, which hit about three hours later after the Landers mainshock, was originally considered an aftershock. However, the United States Geological Survey determined that this was a separate, but related, earthquake. These two earthquakes are considered a regional earthquake sequence, rather than a main shock and aftershock. The 5.7 magnitude Little Skull Mountain (LSM) earthquake the following day, June 29, 1992, at 10:14 UTC near Yucca Mountain, Nevada, is also considered part of the regional sequence and may have been triggered by surface wave energy produced by the Landers earthquake. Foreshock activity, in the form of a significant increase in micro-earthquakes, was observed at Little Skull Mountain following the Landers earthquake, and the activity continued until the main LSM earthquake.
Read more about this topic: 1992 Landers Earthquake
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