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Monday, August 10, 2020 | History

1 edition of Frequency content of ground motions during the 1971 San Fernando earthquake found in the catalog.

Frequency content of ground motions during the 1971 San Fernando earthquake

Frequency content of ground motions during the 1971 San Fernando earthquake

evaluation of seismic safety of buildings Report no. 1

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Published by National Science Foundation Division of Advance environmental Research and Technology in Cambridge Ma .
Written in English


Edition Notes

StatementDepartment of Civil Engineering constructed facilities division Cambridge Ma.
Classifications
LC ClassificationsMLCM 2008/41131
The Physical Object
Pagination74 p. :
Number of Pages74
ID Numbers
Open LibraryOL16721403M
LC Control Number2007406898

For example, "directivity" causes earthquake ground motions in the direction of rupture propagation across a fault to be more severe than that in other directions from the earthquake source. Directivity was clearly demonstrated in the Northridge M earthquake. The fault that broke in the earthquake was a reverse fault dipping to the. Seismograms from 52 aftershocks of the San Fernando earthquake recorded at 25 stations distributed across the San Fernando Valley are examined to identify empirical Green's functions, and characterize the dependence of their waveforms on moment, focal mechanism, source and recording site spatial variations, recording site geology, and recorded frequency band.

SAN FERNANDO EARTHQUAKE OF FEBRUARY 9, [National Academy of Sciences(eds.)] on *FREE* shipping on qualifying offers. SAN FERNANDO EARTHQUAKE OF FEBRUARY 9, Author: National Academy of Sciences(eds.). Analysis of the Pacoima dam accelerogram—San Fernando, California, earthquake of M. D. Trifunac; The presence of the high-frequency motions in the recorded accelerograms is presumably the consequence of the proximity of the recording site to the fault dislocation. Related Book by:

The San Fernando earthquake, also known as Sylmar earthquake, struck the San Fernando Valley near Sylmar at a.m. PST on February 9, , with a magnitude of Rescue efforts at. The San Fernando earthquake (also known as the Sylmar earthquake) struck the San Fernando Valley near Sylmar, California at am PST on February 9, , with a magnitude of [1] The earthquake lasted approximately 60 seconds. [2]There are various names for this earthquake. The USGS and seismologists call it the San Fernando earthquake.. "Sylmar Quake" or "Sylmar Earthquake" is Countries or regions: USA, (Southern California).


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Frequency content of ground motions during the 1971 San Fernando earthquake Download PDF EPUB FB2

The San Fernando earthquake (also known as the Sylmar earthquake) occurred in the early morning of February 9 in the foothills of the San Gabriel Mountains in southern California. The unanticipated thrust earthquake had a magnitude of on the M s scale, and a maximum Mercalli intensity of XI (Extreme).The event was one in a series that affected the Los Angeles area in the late Areas affected: Greater Los Angeles Area.

Download a PDF of "San Fernando Earthquake of February 9, " by the National Research Council for free. Copy the HTML code below to embed this book in your own blog, website, or application. Significance of the Striking Local Ground Motions, 4. Building Code Revision, 5. Back-Up Emergency Services. search input Search input auto suggest.

search filterCited by: Suggested Citation:"icance of Permanent Ground Displacement." National Research Council.

San Fernando Earthquake of February 9, Lessons From a Moderate Earthquake on the Fringe of a Densely Populated Region. Synthetic seismograms calculated for the San Fernando earthquake show strong effects due to lateral variation in sediment thickness in the San Fernando valley and the Los Angeles basin.

Old footage of some of the destruction resulting from the San Fernando earthquake. My dad rushed us out and filmed some of the freeway damage. The. Representation of Earthquake Ground Motions. The analysis of the San Fernando earthquake of revealed a strong frequency dependence of Qp, suggesting that the high frequencies may not be.

analyzed ground motions. 2 METHODOLOGY Parameters considered A relatively large number of parameters are used in the literature to characterize the frequency content of earthquake ground motions.

Many of these are actually periods or frequencies related to the power spectral density (PSD) or to the response by: 5. San Fernando earthquake Top # 13 Facts. The San Fernando, California, earthquake of February 9, ; a preliminary report published jointly by the U.S.

Geological Survey and the National Oceanic and Atmospheric Administration Series title Professional Paper. The authors then studied the distribution of RTBs during the San Fernando earthquake and discovered that it is possible to construct the gray zones to include the damaged buildings from both earthquakes while excluding the sites of the pipe breaks also during both earthquakes.

An example illustrating this is shown in Fig. It can be Cited by: largely on motions of buildings recorded during the San Fernando earthquake.

However, motions of many more build­ ings recorded during recent earthquakes. including the Loma Prieta and Northridge earthquakes, are now avail­ able. These recorded motions provide an opportunity to ex­. Material from San Fernando earthquake was split to Sierra Madre Fault Zone on19 March from this former page's history now serves to provide attribution for that content in the latter page, and it must not be deleted so long as the latter page exists.

Please leave this template in place to link the article histories and preserve this attribution. Abstract. This thesis describes an investigation of the attenuation of strong earthquake ground motion in the 0. 4 to 16 Hz frequency band during the M=, February 9,San. How right they were was demonstrated 23 years later, when almost the same areas of the San Fernando Valley were again struck by a damaging earthquake.

During the Northridge earthquake in Januarymore than 50 people were killed and the quake caused damage worth $35 billion. It also occurred on a hitherto unknown fault, albeit a different.

The San Fernando Earthquake of February 9, occurred virtually at the center of the Southern California strong-motion earthquake instrumentation network, and provided an unprecedented amount of valuable data on strong earthquake -generated ground motions, This data will be of key significance in interpreting the severe damage to many modern engineering structures which occurred, and marks Cited by: 5.

The largest events in the San Fernando earthquake series, initiated by the main shock at 14h 00m s UT on February 9,were chosen for analysis from the first three months of activity, 87 events in all. Allen and his co-workers assigned the.

Two Californian earthquake events may be characterized as historical milestones related to near-source ground motions: the Parkfield and the San Fernando earthquakes. The Parkfield, California, event provided the now famous Station 2 (C02) record at a distance of only 80 m from the fault break (Housner and Trifunac ).Author: Babak Ebrahimian.

Transmission path effects on the spectral composition of ground motion, San Fernando earthquake-- 39 Map showing Nevada Test Site and vicinity Cited by: The San Fernando earthquake (also known as the Sylmar earthquake) occurred in the early morning of February 9 in the foothills of the San Gabriel Mountains in southern California.

The unanticipated thrust earthquake had a moment magnitude of or (as determined by several independent institutions) and had a maximum Mercalli intensity. area captured much of the regional variation in ground motions produced by the Northridge Earthquake (Mw=).

The magnitude, duration and frequency content of these motions are analyzed and compared to predictive relationships typically used in engineering design and to the Uniform Building Code (UBC).Cited by: 1.The San Fernando, California, Earthquake of February 9, A Preliminary Report by Reuben Kachadoorian, Arthur Grantz, Carl M.

Wentworth, et al and a great selection of related books, art and collectibles available now at The earthquake source and strong ground motion. The San Fernando earthquake (9 February,M L =, M W =) was initiated at depth (∼13 km below the surface), north of San Fernando and Sylmar, along a plane dipping 40° to northeast and striking °, and with fault area of km 2 The fault broke the ground surface north of the San Cited by: