The San Andreas Fault, which moves south to north, is the cause for most of this damage and gets the most focus. There is, however, another area that has a lot of past earthquake activity and potential for more in the future.
The San Andreas begins near the Salton Sea and moves north though Southern California and Los Angeles. Near Ventura County and Santa Barbara, the fault makes a slight deviation with a more east and west angle near the mountains in Santa Barbara, sometimes called the Transverse Range because of its different orientation from the north and south Coastal Range and Sierra Nevada.
That deviation before the San Andreas continues in a more north and south direction is a pressure point. At the junction where it deviates, there have been a number of recent earthquakes, in Ridgecrest and a large earthquake many years ago on the Garlock Fault.
Recently, many faults have been discovered in the Sierra and Southern Cascades. This area on the eastside of the Sierra and Lake Tahoe has been active with many smaller earthquakes and swarms over the last 150 years.
Thursday’s 6.0 earthquake near Markleeville is a good reminder the activity of the area, which has a high likelihood of moderate to strong earthquakes.
Another sign of an active geologic area is the number of hot springs and volcanoes. Lassen Peak had a series of major eruptions in the 1910s and remains dormant for now. Some recent studies have placed the Mammoth Lakes area, Lassen, and Mt. Shasta zones as potentially active volcanic regions again in the future.
ALL ABOUT EARTHQUAKE PREP:
- What you need to know about ShakeAlert, the earthquake warning system | Earthquake Ready or Not
- What can happen to our power grids after an earthquake? | Earthquake Ready or Not
- Why a disaster kit will help you survive the next big one | Earthquake Ready or Not
- What you need to know about the San Andreas fault | Earthquake Ready or Not
- The science of forecasting earthquakes | Earthquake Ready or Not
- How vulnerable is California to tsunamis? | Earthquake Ready or Not
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