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Fig. 3 | Earth, Planets and Space

Fig. 3

From: Characteristics of the foreshock occurrence for Mj3.0 to 7.2 shallow onshore earthquakes in Japan

Fig. 3

An example of earthquake swarm on December 18, 2009. The red circle is the mainshock, white circles are earlier earthquakes within 30 days and 30 km (most of them are within 1 day and 5 km), magnitudes are shown by the size of circles. This sequence includes 277 earlier earthquakes, which is an order of magnitude more than the typical foreshock occurrence levels which are usually 1 to 15 earthquakes

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