The Parkfield quake was magnitude 6.0, compared to Izmit's 7.6 and Bouchon thinks foreshocks may only occur in very large quakes.
帕克·菲尔德地震是6.0级，而土耳其伊兹·米特地震为7.6级，所以布乔认为，前震可能只会在非常大的地震中出现。
The Parkfield quake was magnitude 6.0, compared to Izmit's 7.6 and Bouchon thinks foreshocks may only occur in very large quakes.
帕克·菲尔德地震是6.0级，而土耳其伊兹·米特地震为7.6级，所以布乔认为，前震可能只会在非常大的地震中出现。
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