2008 Chino Hills Earthquake - Aftershocks

Aftershocks

Approximately 100 minor aftershocks and one presumed foreshock were reported within two days after the earthquake, 27 of which occurred within an hour after the earthquake. Four aftershocks of at least 3.0 in magnitude were reported—the first, nine minutes following the initial earthquake, was the largest at magnitude 3.8; and two others, occurring over two hours later, were recorded at magnitude 3.6. Twenty-eight aftershocks of at least 2.0 were reported. One presumed foreshock, magnitude 1.3, occurred sixteen hours prior to the earthquake in the same location as the main shock.