08-09-2017, 09:03 AM
Autonomous seismic data recording systems for active source reflection seismic survey studies provide a valuable byproduct: a continuous seismic record of a dense seismic network over the study area. This dense exploration network serves as a reduced version of the global passive seismic network that provides natural seismicity and ambient noise data that can be used to study the interior of the Earth. This presentation describes the results of the application of various techniques to passive data acquired using an autonomous seismic recording system. A 57 square kilometer 3D seismic survey conducted in early 2011 in Long Beach, California, resulted in six months of continuous passive seismic data from a static receiving seismic network of 5,400. The natural seismicity and environmental noise identified in this set of continuous passive data were extracted for signal used to extract p-wave and shear-wave velocities, anisotropy information and seismic imaging products that provide value to the active source data; as well as other information that would benefit exploration and studies related to the earthquake in the study area. The analyzes in the mine data set include: ground motion studies at time intervals, micro seismic detection and location, surface wave interferometry, environmental noise correlation for reflection images, receiver functions, and amplitude analysis of events.