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They might help bridge the gap between observations of real fault systems and laboratory earthquake experiments where foreshock occurrence is commonly observed.
The USGS said Friday's earthquake was about 11 times more forceful than Thursday's tremor, which geologists described as a foreshock to the larger one.
Wagner was at her home in the small city of 29,000 people when a small foreshock hit, followed by the large one, putting her and her 11-year-old daughter on edge.
Lucy Jones, a seismologist at the California Institute of Technology and a former science adviser at the Geological Survey, tweeted that Thursday's earthquake was a "foreshock" and Friday's quake was on the same fault system.
The quake, which followed a 6.4 magnitude foreshock on 4 July, was the biggest the region has suffered in 20 years and was felt as far away as Mexico and Las Vegas after it struck on Friday evening, CNN reported.
That tremor is now considered a foreshock to the much larger quake Friday night.
(TAP) - A powerful magnitude 7.1 earthquake shook Southern California on Friday, causing some damage to buildings, fires and some injuries, with eight times more force than a foreshock that rattled the same area a day earlier, officials said.
'In quakes like these, the first one might be the foreshock while the second is the main shock.
Moderate foreshock and aftershock shook the area as well.
When asked by reporters if the magnitude 6.0 quake was a foreshock of an even bigger earthquake, Chen replied, "It can't be ruled out, however the probability is relatively small."
Main, "A damage mechanics model for power-law creep and earthquake aftershock and foreshock sequences," Geophysical Journal International, vol.
 used the K-Means cluster to partition Iran into six main clusters and to study the importance of foreshock precursors for different zones.
All aftershocks and foreshock should be eliminated from the catalogues (Abrahamson, 2006).
In Oklahoma, "The M5.0 foreshock occurred in close proximity to active fluid injection wells.
Dan responded correctly only to the untaught prefixed words forethought (session 6), foresight (session 9), and forethought and foreshock (session 15) after root word training.
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