UCLA seismic line crossing San Andreas fault in Cholame

The UCLA seismology group started installation of earthquake detectors (seismic stations) across the southern San Andreas Fault. The profile will consist of the seismic stations located approximately every 10 km along the line connecting Morro Bay and Corcoran. Two kinds of seismic stations will be installed: traditional standalone and wirelessly connected (Geonet ), with an immediate data delivery in case of an event over a cell phone uplink. The advantages of a short delay access to the data and analysis include testing the equipment integrity and relocating stations if needed, as well as making decisions on the basis of seismic activity. The sites will record local and teleseismic (distant) earthquakes as well as provide wide-angle measurements of tremors.

There are several science objectives:
- measure earthquake sources in the near field to understand the underlying physics and the process of faulting;
- make a structural model of the base of the crust including offsets caused by the San Andreas Fault;
- analyze aftershock sequences, assess their possible damage;

- evaluate the role of the southern Sierras tomographic anomaly in the stresses that are causing earthquakes and mountain building;
- study tremors (very faint and periodic rumblings) originating 20-40 kilometers below the surface.


standalone
site CP05
site CP11
started on Cinco de Mayo, 2012
standalone
site CP15
site CP17
started in June, 2012
geonet/cell
site CP13
site CP14
in testing since July, 2012