People are talking about the “unprecedented” movement of the Garlock fault after the Ridgecrest quake. It’s true we haven’t seen this in the 30 years of modern geodesy on the Garlock fault. But we’ve seen it many times on the San Andreas & it has never caused a quake. 1/
The movement on the Garlock is called triggered aseismic creep. It is in the top few hundred meters of the fault. No quake can occur in the shallow part because there’s no confining pressure. Big quakes begin 10-15 km down. 2/
Big quakes triggered aseismic creep on the San Andreas fault in 1979, 1992 & 1999. The creep never caused another quake. Ridgecrest was the first big quake near the Garlock since we have records so it’s the 1st time we’ve seen creep on the Garlock. But it’s not unprecedented
