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Regional it can be argued that indeed there are earthquake seasons. Earthquakes are more often than not related to tectonic activity (subduction, rifting, shearing along transform faults, etc.); however, not all earthquakes are related to such activity. Crustal loading through increased sedimentation can increase the overriding pressure, and once this is removed through weathering processes, this can release pressure causing earthquakes (for example those within stable continental shields). There is certainly an earthquake season in the Himalayan front and has been investigated by geologists at Caltech.

"In the Himalaya, monsoon rains swell the rivers of the Ganges basin, increasing the pressure bearing down on the region. As the rains stop, the river water soaks through the ground and the built-up load eases outward, toward the front of the range. This outward redistribution of stress after the rains end leads to horizontal compression in the mountain range later in the year, triggering the wintertime earthquakes."

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14y ago

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