![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjLCsVZUHRhsOddWMWaRB3jvJNtNA0Es6oeCimMJgWSRQiS_1E9OjBs6etZQoAMv5-V1_uFJdvI2b5GyD1Uy5Fxx5PPVySvVviOiF52nCPCv_1FDpdRR_ZL73iEBBzYNDgdNYlK/s320/m4.8+SAF+3-24-09.jpg)
Yesterday's M4.8 earthquake by the Salton Sea in southern California [right, USGS] following a series of smaller events in the previous week, has seismologists wondering if this could be a foreshock for something larger.
[below, Mohawk Valley (113A) seismometer records aftershocks of yesterday's M4.8 event on the southern San Andreas fault, including a M3.6 event a
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhIiqVYPK2JsSBZOp052WjE8pfzeSDtVOI1-HfIQt3dQxEujsgTFOus7AvLpFUW5bTsoXr1Ym657eq2JOntzP_E53OwDnjs87SMP1cDkQmxTmqAN4ARIBYnIchiJ8kg0-efkpwr/s320/mohawk+113a.png)
The series of recent small earthquakes are on the southern tip of the San Andreas fault, suggesting that a larger event would rupture from south to north, with the energy focused into southern California. We expect a north to south rupture would send more energy across Arizona.
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