Margin Seismology
Figure 4.
This local earthquake is a M 3.0 which occurred in San Juan Bautista approximately 85 km from MOBB (based on the observed S-P time). The velocity data has been 1.0 Hz HP filtered to enhance the earthquake signal. The N-component did not register the event (the traces are  individually scaled and the N-component signal is actually much smaller than the Z- and E-component signals).

Oct. 07, 2009 East component mass position