Patent ID: 7457195
Filing Date: 2008-11-25
Classification: G01V

Abstract:
1. Data processing apparatus for calculating an estimated time of arrival of a seismic or microseismic P or S wave at a sensor station, the seismic or microseismic P or S wave being generated by a seismic or a microseismic event, comprising a data processor that: a) calculates an estimated time of origin for the seismic or the microseismic event generating the P and S waves, based on a P to S wave velocity ratio and picked arrival times of the P and S waves at a sensor station other than the one for which the estimated time of arrival of the P or S wave is to be calculated; and b) calculates the estimated time of arrival of the P or S wave without knowledge of a location of the seismic or microseismic event based on a P to S wave velocity ratio, the estimated time of origin of the event and, where the estimated arrival time of a P wave is to be calculated, a picked arrival time of the S wave at the sensor station for which the estimated arrival time of the P wave is being calculated or, where the estimated arrival time of a S wave is to be calculated, a picked arrival time of the P wave at the sensor station for which the estimated arrival time of the S wave is to be calculated.