Abstract
A method for automatic reading of phase times from seismic wave data developed by MAEDA (1985) was put into operation in the automatic seismic data processing system at Regional Center for Earthquake Prediction, Faculty of Science, Kyoto University [WATANABE et al. (1982)]. In this study, the data obtained by the automatic processing are compared with those by the off-line processing (manual reading) in order to see the reliability of the method for automatic reading.The results are as follows: (1) About 90 percent of the differences between respective P times determined by the two processing falls in the range from -0.05s to 0.05s. (2) The second-order moment around zero of the differences between respective S times is 0.262(s2). (3) About 90 percent of the distances between respective epicenters and between respective hypocenters fall within 2.5km and 3.5km, respectively. (4) As to the ability of the automatic processing to read P times, the automatic processing can not pick as weak P onsets as the off-line processing can. But the difference of the detection capability is not so large. It is estimated as 0.36 in magnitude scale on average.As mentioned above, it is verified that the automatic processing system, which uses the method developed by MAEDA (1985), attains the aim to offer the reliable seismic information.
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Schedule a callMore From: Zisin (Journal of the Seismological Society of Japan. 2nd ser.)
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