書誌事項
- タイトル別名
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- Determination of P Wave Onset Times by a Digital Computer
- ケイサンキ ニヨル ジシンハ ノ ジドウ ヨミトリ ニ ツイテ Pハ ケンソク
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Programs for automatic reading of seismic P wave onset by a digital computer are introduced. These programs are composed of a series of simple processes as follows. A low cut recursive filter is used to increase S/N amplitude ratio. The arrival times of P waves are read by means of comparison with a threshold level corresponding to noise level before the P waves. Discrimination between P arrivals and noises are made by counting the number of points where amplitude of the wave exceeds the threshold level during a pre-set time interval. Then, the earlier of the closest two reading times among the three independently obtained from the three component data, is selected as the best P wave onset time.<br>As the result, 66% of microearthquakes observed at the Iwatsuki deep borehole observatory could be read within the time difference of 0.1sec between the automatic readings and ordinary visual readings.<br>Furthermore, an effective indicator of reliability of the finally adopted P onset times is discussed.
収録刊行物
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- 地震 第2輯
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地震 第2輯 29 (4), 383-394, 1976
公益社団法人 日本地震学会
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詳細情報 詳細情報について
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- CRID
- 1390001204303868672
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- NII論文ID
- 130006784926
- 40001525901
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- NII書誌ID
- AN00305741
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- ISSN
- 18839029
- 2186599X
- 00371114
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- NDL書誌ID
- 1800262
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- データソース種別
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- JaLC
- NDL
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