Today’s M 4.2 quake likely struck on a ‘tear fault’ that connects portions of the 1971 San Fernando earthquake rupture. Today’s event is strike-slip, whereas the 1971 event was largely thrust. Is this a 50-year-old aftershock or an independent event? Probably the former.
- Does Alaska’s magnitude-7.8 Simeonof earthquake finally close a seismic gap? - August 1, 2020
- M 4.2 in San Fernando - July 30, 2020
- Hydrated oceanic crust supports benign plate movement at subduction zones - July 23, 2020