ARCHIVED REPORTS_2010_1 - Laserfiche WebLink

Home Browse Search

The Calaveras Fault has generated several historical earthquakes over magnitude 5. The largest historical earthquake associated with the Calaveras fault was the magnitude 6.6 earthquake in 1911. The expected recurrence of earthquakes on the Calaveras Fault is shown in Figure 1. Using the long term slip-rates (Table 1), there is about a 1/3 chance of a magnitude 6.5 earthquake on the Northern Calaveras in the next 100 years. Since this is smaller than the largest historical earthquake, the MME is defined by the historical earthquake magnitude. The recommended MME is a magnitude 6.6 earthquake at a distance of 83 km. Franklin Fault The Franklin fault is located 84 km west of the site. The Franklin fault is 34 km long with predominantly strike-slip motion. No historical earthquakes over magnitude 5 have occurred on the Franklin Fault. The frequency of occurrence of earthquakes on the Franklin Fault is estimated using the fault parameters listed in Table 1 and a standard truncated exponential model (Youngs and Coppersmith, 1985). The 100-year probability of at least one earthquake of magnitude M or larger is shown in Figure 1. Based on the long term slip-rate, there is about a 1/3 chance of having a magnitude 5.5 earthquake or larger on the Franklin Fault in the next 100 years. 3 The recommended MME is a magnitude 5.5 earthquake at a distance of 84 km. Napa Fault The Napa fault is located 89 km west of the site. The Napa fault is 35 km long with predominantly strike-slip motion. No historical earthquakes over magnitude 5 have occurred on the Napa Fault. The frequency of occurrence of earthquakes on the Napa Fault is estimated using the fault parameters listed in Table 1 and a standard truncated exponential model (Youngs and Coppersmith, 1985). The 100-year probability of at least one earthquake of magnitude M or larger is shown in Figure 1. Based on the long term slip-rate, there is