2004_event Parkfield_earthquake
aftershocks (october 11, 2004) note paso robles sympathetic events. (cholame located near southernmost yellow square on eastern side of san andreas fault extending south-southeast parkfield) the 6.0 magnitude primary shock in 2004 result of fault movement of 18 inches (.5 meter). there have been no indications found have been used predict earthquake. although overdue, probability of quake occurring in 2004 has been estimated @ ten percent. magnitude of event consistent previous earthquakes in region. substantial aftershocks continued more week after initial event, moving in northwesterly progression. in october, there cluster of small earthquakes near paso robles near parallel fault west. these may in response transfer of stress these faults after release of stress @ parkfield. past earthquakes have occurred east of parkfield @ same distance san andreas fault near coalinga , avenal.