The book Note On Earthquake Intensity in San Francisco was written by author Holden Edward Singleton Here you can read free online of Note On Earthquake Intensity in San Francisco book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Note On Earthquake Intensity in San Francisco a good or bad book?
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. 2 Total, . 200 Beside the 200 shocks of known intensity, there are 217 shocks printed in my catalogue. No doubt a great number of the lighter shocks (I, II, III, ) are not recorded at all. Earthquake action is so irregular and lawless, that it is not possible to make any estimate however rough of the number of these lighter shocks. Experience has amply proved that the average intensity of San Francisco shocks is not above IY on the Rossi-Forel scale. The vast majority of our shocks are II and... III and the average is certainly below IY. I shall, therefore, assume this fact as a basis for computation. The 200 shocks of known intensity are evaluated and summed up in the following table : 8 shocks of intensity 4 55 50 58 12 4 7 2 I correspond to 8 x 20 II 4x 40 III 55 x 60 IV 50 x 80 V 58 x 110 VI 12 x 150 VII 4x 300 VIII 7x 500 IX 2x 1200 Units of Acceleration. = 160 = 160 = 3300 = 4000 = 6380 = 1800 = 1200 = 3500 = 2400 200 recorded shocks of known intensities correspond to 22900 units.
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