The vast majority of earthquakes we feel come soon after smaller ones, according to new research that offers new insights into how seismology works.
The finding offers unprecedented insight into what happens before moderate and large earthquakes — and scientists are finding that the vast majority of them occur after smaller earthquakes start rippling underneath the ground, sometimes days or even weeks before the main shock.study’s
Previously, scientists observed that only half of all moderate quakes had precursor smaller events. Now, this new study of earthquakes in Southern California of at least magnitude 4 between 2008 and 2017 finds that at least 72% of them had earlier, smaller quakes.“Elevated foreshock activity is pervasive in Southern California,” the study concluded.
The finding doesn’t mean we should all suddenly be worried about small quakes. Statistically speaking, only 5% of earthquakes are followed up by something worse. “The vast majority of time that you have an earthquake, even if you see anomalous activity start up, it’s going to die down on its own — that’s most of the time,” Ross said.
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