Earthquake extraction and correlation energy at Long Beach, California seismic survey

Data

The Long Beach 3D seismic array was deployed by Nodal Seismic, Inc. for recording both passive and active seismic surveys. The array consists of about $2400$ vertical-component geophones covering a region approximately $8.5$  km north-south by $4$  km east-west (Figure 1). Average station spacing is $330$  m, both inline and crossline. While battery life limitations means stations are swapped out approximately every $8$ days, station locations stay consistent throughout the survey. Data were being continuously recorded ($24$  hours/day) over a span of four months starting in January $2012$ , with a sampling rate of $500$  Hz. This has provided us with approximately $48$  TB of data. While the data have been low-cut at $3$  Hz, there is still energy found in the suppressed lower frequencies.

lbmap Figure 1. Map of receivers comprising the Long Beach 3D seismic array.

Earthquake extraction and correlation energy at Long Beach, California seismic survey