On connections between torrential rainfall from tropical cyclones and earthquakes:
https://phys.org/news/2018-01-heavy-tropical-cyclones-distort-ground.htmlTitle: Study suggests heavy rains from tropical cyclones distort the ground below
Excerpt:
The new study in Geophysical Research Letters, a journal of the American Geophysical Union, finds that compression of Earth's crust is correlated with heavy rainfall from hurricanes and typhoons, known collectively as tropical cyclones. The added weight of all that water likely causes the ground underneath the storm to deform, according to the study's authors.
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The results of the new study call into question whether tropical cyclones can trigger earthquakes. An earlier study published in the journal Nature suggested that dilatation of the Earth's crust by cyclones triggered slow earthquakes that caused compression of the crust. But the new study suggests that heavy rainfall, rather than slow earthquakes, causes compression.
The amount of ground deformation detected by the strainmeters in the new study is similar in strength to local seismic events, sometimes as strong as magnitude 5 earthquakes. However, they take place over a longer span of time. Strain associated with earthquakes occurs within seconds to minutes, while strain induced by tropical cyclones happens over several hours to days.