Strong motion earthquake accelerograms, digitized and plotted data, Volume I - uncorrected accelerograms; Part E - Accelerograms IE071 through IE085

Abstract

The first set of twenty uncorrected digitized earthquake accelerograms was published in July, 1969 as Volume I, Part A, of the present series. That volume also contained introductory material and background information describing the methods used, accuracies, etc. , which should be referred to by all users of the data. The San Fernando Earthquake provided records of such importance that the original plan was interrupted after two parts, and Part C contained the first of the San Fernando Earthquake accelerograms. This issue continues the San Fernando accelerograms and contains fifteen records consisting of three records each from four buildings, two records from Santa Felicia Dam and a ground record from Wheeler Ridge. Some comments on these records follow. IE071. Wheeler Ridge. The entire 30 second record was digitized. The time marks functioned for only two seconds, and therefore the paper speed was calculated from an average value during the preceding calibration test. IE072, 73, 74. 4680 Wilshire Boulevard, Basement, 3rd and 6th Floors. There is a hesitation of 0.2 second duration in the record in the basement during the first second of operation. Aligning this record with the other two may consequently require considerable care. IE075, 76, 77. 3470 Wilshire Boulevard, Sub-basement, 5th and 11th Floors. The sub-basement record was digitized on a different machine from that at Caltech and only 44 seconds could be handled. The upper floor records were digitized to 64 seconds, just short of the total record length. IE078, 79, 80. Los Angeles Water and Power Building, Basement, 7th and 15th Floors. The basement record was digitized to 57 seconds by which time the first aftershock had diminished. The upper floor records were digitized for a further 15 seconds. IE081, 82, Santa Felicia Dam, Outlet Works and Crest. Both records have been digitized the total length. IE082, 83, 84. 3407 Sixth Street, Basement, 4th Floor and Penthouse. The entire 60 second records were digitized. As in previous reports the printout and plots of those records that require shifting in the digitizer contain asterisks and arrows, respectively, indicating where such shifts occurred.

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