In addition to the San Fernando earthquake, research initiatives were established after the 1985 Mexico City earthquake, the 1987 Whittier Narrows earthquake, and the 1989 Loma Prieta earthquake. '!he initial trem:>r was followed by nore than 15 aftershocks in excess of 3 on the Richter scale. Because of the earthquake activity in the Los Angeles Metropolitan area, buildings and other public structures had been equipped with accelerometers, and both the mainshock and the primary aftershock provided additional data for seismologists to analyze and compare with other southern California events. On October 31, 1989, Governor Deukmejian c led the State Legislature into Extraordinary Session commenci g November 2nd t provide assistance and relief to victims of the October 17th Northern Ca fornia Earthquake. Beginning with the 1983 Coalinga earthquake, a blind thrust event in the central coast ranges of California, a change in perspective was brought about regarding these types of (concealed) faults. The closest recognized active fault in the vicinity of the Pasadena earthquake is the Raymond fault, a fault for which the nature of slip has been a matter of debate for several decades. The shock's effects were assessed at VII (Very strong) on the Mercalli Intensity Scale with damaged chimneys, broken windows, and the collapse of two bell towers at the San Gabriel Civic Auditorium. The structural geology of the Los Angeles area is dominated by three major compressional uplift trends: (1) the Palos Verdes anticlinorium and western shelf, (2) the Santa Monica Mountains anticlinorium, and (3) the Verdugo Mountains-San … Traces T and C correspond to the high-resolution seismic Research agendas for these initiatives usually focused. Five faults are situated within close proximity to Cypress: Newport-Inglewood, Norwalk, El Modena, Whittier-Elsinore, and Elysian Park. But Whittier Narrows is located in Rosemead, the neighboring city to South El Monte, and the … When relocating the blast using the new models and delays, the absolute hypocentral location bias is less than 0.5 km. At 4:57 a.m. local time (11:57 UTC) on June 28, 1992, a magnitude 7.3 earthquake awoke much of Southern California. IN LOS ANGELES TO MOTIONS CAUSED BY WHITTIER NARROWS, CALIFORNIA, EARTHQUAKE OF OCTOBER 1, 1987 by M. Qelebi1 , E. Safak1 and N. Youssef2 OPEN-FILE REPORT 89-542 This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards (or with the North American Stratigraphic Code). Geophysics, Marine Seismologist Lucy Jones says the epicenter is near the location of the 1987 Whittier Narrows earthquake. '!he initial trem:>r was followed by nore than 15 aftershocks in excess of 3 on the Richter scale. The moderate 5.9 magnitude blind thrust earthquake was centered several miles north of Whittier in the town of Rosemead, had a relatively shallow depth, and was felt throughout southern California and southern Nevada.Many homes and … A twelve-story steel frame building in Alhambra was outfitted with accelerographs in the basement, at mid-level, and at the top of the structure. The bricks were then cleaned, then stored until they could be used in the rebuilding of the apartment. The deadly Whittier Narrows earthquake jolted Southern California at 7:42 a.m. on Oct. 1, 1987, marking the Los Angeles area’s most destructive earthquake in nearly two decades. Just 3 hours after the Whittier Narrows earthquake struck, it became clear that a heretofore unseen geological structure was seismically active beneath metropolitan Los Angeles. The Whittier Conservancy also collaborated in the rezoning of the Hadley neighborhood and was able to help control the rate of new multiple-family dwelling construction. At a Richter magnitude of5.9 (hereafter M5.9), Whittier-Narrowsfell far short ofLorna Prieta'sM7.1 mainshock intensity. October 17, 1989: $10 billion. They spent $15,000 to prevent the usable bricks from being taken during the final demolition of the building. As this research progressed, on October 1, 1987, the Magnitude 6.0 Whittier Narrows earthquake shook the Los Angeles area, causing significant shear damage to the I-605/I-5 Separation. Until the October 1989 Lorna Prieta temblor, Whittier-Narrowswas the most recent damaging earthquake in urban California. The shock occurred at a depth of 13 kilometers (8.1 mi) and was most intense to the southwest of the city, where a school and two homes were heavily damaged and other homes sustained chimney collapses. [14][15], "6.0 Quake Rocks L.A. : At Least 3 Dead, Scores Hurt, Buildings Damaged : Woman Dies at Cal Man Trapped in Tunnel", "Recent earthquakes near Whittier, California", "Whittier Conservancy Fights for 100-Year-Old Bricks", "Whittier : Conservancy Honored for Preservation Work", "Whittier Narrows 1987: M 5.9 - 2km SSW of Rosemead, CA", Fullerton Joint Union High School District, Southern California University of Health Sciences, Fred C. Nelles Youth Correctional Facility, https://en.wikipedia.org/w/index.php?title=1987_Whittier_Narrows_earthquake&oldid=1012987978, 1987 natural disasters in the United States, Geology of Los Angeles County, California, Creative Commons Attribution-ShareAlike License, This page was last edited on 19 March 2021, at 12:09. [7], While total casualties amounted to eight, the destruction of homes was significant. Communication systems and local media were temporarily impaired and power was cut, leaving numerous early morning workers stranded in disabled elevators. [14], Some effort was made to save and use the bricks for rebuilding the historic apartment on the corner of Greenleaf Avenue and Hadley Street. Practical Lessons from the Loma Prieta … The “Fallen Monument” toppled during the October 1 st 1987, Whittier Narrows earthquake, and was donated in separate broken pieces by Forest Lawn Memorial Parks. The decay rate of aftershock occurrences with time was fast, while the b value was low (0.67±0.05) for a Los Angeles basin sequence. B7, PAGES 9607-9613, JULY 10, 1989 Influence of Focal Mechanism on Peak Accelerations of Strong Motions of the Whittier Narrows, California, Earthquake and an Aftershock JOHN E. VIDALE University of California, Santa Cruz Focal mechanisms affect the pattern of the peak accelerations of the October 1, 1987 Whittier Narrows earthquake and its October 4 aftershock. Peak ground floor accelerations for the 1987 Whittier Narrows earthquake were 0.17 g in the transverse direction, reached at 3.6 sec. Through this initiative, property tax revenue is directed to the city rather than to the county and schools, the originally designated recipients. [11][12], In order to gather funds to help the rebuilding effort, the city of Whittier approved the establishment of a 521-acre earthquake recovery redevelopment area. A0–A2, B–B4, and C–C2 mark the traces of seismic reflection profiles and cross sections shown in Figures 2, 3, 5, 7, and 8. A cluster of reverse faulting events on north striking planes occurred within hours after the mainshock, 2 km to the west of the mainshock. For longtime Whittier residents, Oct. 1, 1987, is the day they’ll never forget. Although most of the … The moderate 5.9 magnitude blind thrust earthquake was centered several miles north of Whittier in the town of Rosemead, had a relatively shallow depth, and was felt throughout southern California and southern Nevada. Although the epicenter of this earthquake is only about 12 kilo meters from the epicenter of the M=5.9 Whittier Narrows earthquake of October 1, 1987, there is apparently no direct relationship between the two events. Lighter accelerations were observed than the main shock, with peak accelerations in the range of .15g–.33g, all occurring at six stations that were within 12 kilometers (7.5 mi) of the epicenter. A ten-story reinforced concrete building in Whittier (7215 Bright Ave.) saw a peak horizontal reading of .63g in the basement. Whittier-Narrows Earthquake The main shock of the Whittier-Narrows earthquake occurred as a reverse motion on a buried fault at an approximate depth of 10 to 14 km with no surface expression of fault displacement. B7, PAGES 9545-9547, JULY 10, 1989 The 1987 Whittier Narrows, California, Earthquake: A Metropolitan Shock EGILL HAUKSSON Department of Geological Sciences, University of Southern California, Los Angeles Ross S. STEIN U.S. Geological Survey, Menlo Park, California Just 3 hours after the Whittier Narrows earthquake struck, it became … showing the location of the 1987 Whittier Narrows (M w 6) earthquake sequence (Hauksson and Jones, 1989) as relocated by Shaw and Shearer, (1999). Properties of Rocks, Computational A major earthquake measurirg 6.1 on the Richter scale occurred in the Los Argeles Metropolitan Area at 7:42 a.m. on october 1, 1987. Objects, Solid Surface We would like to thank Charlie Sammis and Andy Michaels for reviewing this introduction and the authors of the Whittier Narrows Earthquake special section for making preprints of their papers available to us. Damage to the Arcadia Public Library as a result of the Whittier Narrows earthquake. [10], The 1929 Whittier earthquake occurred on July 8 with a local magnitude of 4.7 and maximum perceived intensity of VII (Very strong) on the Mercalli Intensity scale. Many homes and businesses were affected, along with roadway disruptions, mainly in Los Angeles and Orange [5], The main shock occurred near the northwestern border of Puente Hills 3 kilometers (1.9 mi) north of the Whittier Narrows at a depth of 14 kilometers (8.7 mi). It caused $65 million in estilIlated damage am killed at least 3 … The moderate 5.9 magnitude blind thrust earthquake was centered several miles north of Whittier in the town of Rosemead, had a relatively shallow depth, and was felt throughout southern California and southern Nevada.A large number of … in Modeling Earth Systems (JAMES), Perspectives of Earth and Space Scientists, Journal of Geophysical Research Because the Pasadena earthquake occurred at 16 km depth and did not cause surface rupture, it is … This reinforced … The fault was delineated by the mainshock and aftershock focal mechanisms, fault plane reflection studies, and high resolution seismic profiles, which also revealed that the fault runs from downtown Los Angeles to near Puente Hills. [13], A nonprofit organization called the Whittier Conservancy was formed shortly after the Whittier Narrows earthquake. Davis et al. (1896-1977), Chinese Journal of Geophysics (2000-2018), International Of that amount, $13.5 million was for CSU and $1.8 million for the community colleges. Just 3 hours after the Whittier Narrows earthquake struck, it became clear that a heretofore unseen geological structure was seismically active beneath metropolitan Los Angeles. The group aids in the preservation of the city's historical style of construction. The peak accelerations observed … It was 7:42 a.m. when the 5.9-magnitude Whittier Narrows earthquake struck. Other typical failures included more than 1,000 gas leaks, with many resulting in fire, ceramic elements on high-voltage substation equipment breaking, and phone systems becoming overwhelmed. The system is considered one of the highest-risk faults in the United States due to its moderate dip and its location under a large metropolitan area. Geophysics, Mathematical In addition to the San Fernando earthquake, research initiatives were established after the 1985 Mexico City earthquake, the 1987 Whittier Narrows earthquake, and the 1989 Loma Prieta earthquake. Suggested Citation:"5. The devastating effects of earthquakes have been demonstrated repeatedly in the past decade, through moderate and major earthquakes such as the October 1987 Whittier Narrows earthquake (5.9 on the Richter scale), the October 1989 Loma Prieta earthquake (7.1) and the January 1994 Northridge earthquake (6.7). See more ideas about northridge, whittier, earthquake. Although the epicenter of this earthquake is only about 12 kilo meters from the epicenter of the M=5.9 Whittier Narrows earthquake of October 1, 1987, there is apparently no direct relationship between the two events. The devastating effects of earthquakes have been demonstrated repeatedly in the past decade, through moderate and major earthquakes such as the October 1987 Whittier Narrows earthquake (5.9 on the Richter scale), the October 1989 Loma Prieta earthquake (7.1) and the January 1994 Northridge earthquake (6.7). Lucile Jones of the U. S. Geological Sur vey describes the faulting mechanism of the Pasadena earthquake as The closest recognized active fault in the vicinity of the Pasadena earthquake is the Raymond fault, a fault for which the nature of slip has been a matter of debate for several decades. Nine of these instruments were located on the Caltech campus, two were at the nine story Jet Propulsion Laboratory building 180 (ten miles northwest of the campus) and the final device was placed on a hillside 5 km to the west. and you may need to create a new Wiley Online Library account. Although most of the 59 aftershock focal mechanisms presented here document a complex sequence of faulting, they are consistent with deformation of the hanging wall caused by the thrust faulting observed in the mainshock. '!he earthquake was centered in the Whittier ~area about seven miles south of Pasadena. They were built with bricks that appeared to have been made by hand during the 19th century; the mud used to make them came from the San Gabriel River. TYPE OF FAULTING: thrust TIME: October 1, 1987 LOCATION: 34° 03.68' N, 118° 04.71' W 11 km (7 miles) southeast of Pasadena MAGNITUDE: M L 5.9 DEPTH: 9.5 km. The San Andreas and San Jacinto faults are located some distance from Cypress, but have the … It was 7:42 a.m. when the 5.9-magnitude Whittier Narrows earthquake struck. The deadly Whittier Narrows earthquake jolted Southern California at 7:42 a.m. on Oct. 1, 1987, marking the Los Angeles area’s most destructive earthquake in nearly two decades. Nevertheless, the Whittier earthquake had signficant disruptive … [6], This aftershock was recorded on thirty of the NSMIN stations at distances of up to 57 kilometers (35 mi). The old commercial district saw the worst damage, as these were the oldest buildings, and were also heavily damaged in the 1929 Whittier earthquake, a shock may have been a result of movement on the Norwalk Fault. A possible cause of this asymmetry was the earth's subsurface geological structure that managed to attenuate or defocus more severely the seismic waves that travelled east of … Earthquake aftermath footage - Christchurch Earthquake 23 December 2011 Disastrous Earthquakes. Geese @ Whittier Narrows Park. [8], Caltech scientists recorded the events on a cluster of twelve strong motion sensors that were placed throughout the region with a total of 87 channels of recorded data. First motion polarities, along with modelling of teleseismic P and S-waves, established that the thrust fault responsible for the shock strikes east-west with a dip of 25° dip to the north. For longtime Whittier residents, Oct. 1, 1987, is the day they’ll never forget. Though it turned out it was not the so-called "Big One" as many people would think, it was still a very strong earthquake.The shaking lasted for two to three minutes. Whittier Narrows earthquake. Physics, Comets and Earthquakes: 1987 Whittier Narrows, 1989 Loma Prieta, 1994 Northridge, 1992 Landers, 2014 South Napa. The aftershocks define an approximately circular surface that dips gently to the north, centered at the hypocenter of the mainshock with a diameter of 4–6 km. 1994. That earthquake was a magnitude 5.9 and killed eight people. Using a survey approach like the one they employed after the 1987 Whittier Narrows earthquake, Linda Bourque, James Goltz, and their associates conducted a telephone survey with a random sample of 656 respondents in the five counties most seriously affected by the Loma Prieta earthquake. and Petrology, Exploration JOURNAL OF GEOPHYSICAL RESEARCH, VOL. The Whittier Narrows earthquake sequence (local magnitude, M L = 5.9), which caused over $358-million damage, indicates that assessments of earthquake hazards in the Los Angeles metropolitan area may be underestimated. This earthquake occurred on a previously unknown, concealed thrust fault approximately 20 km east of downtown Los Angeles, California. The Conservancy felt that these bricks were worth saving, not only for the historical value, but also for their aesthetics. The October 1987 shock occurred on a previously unrecognized blind thrust fault that is now known as the Puente Hills thrust system. Disastrous Earthquakes. Foundation in the aftermath of the Whittier Narrows Earthquake (October 1, 1987). Peak accelerations at the top floor were 0.20 g, reached at 9.2 seconds in Damage to Whittier was estimated at $100 million. 1990-1999. 'IHE EVEN!' Planets, Magnetospheric The last time the San Francisco Bay region shook like it did on Sunday … Received February 20, 1989; accepted February 22, 1989. Use the link below to share a full-text version of this article with your friends and colleagues. Whittier Narrows Earthquake Early in 1987, Caltrans began the column retrofit seismic research program in an effort to develop methods to retrofit existing single column bents. Contrary to initial expectations of strike-slip or oblique-slip motion on the Whittier fault, whose north end abuts the aftershock zone, the focal mechanism of the mainshock showed pure thrust faulting on a … Small Bodies, Solar Systems At 4:57 a.m. local time (11:57 UTC) on June 28, 1992, a magnitude 7.3 earthquake awoke much of Southern California. Learn about our remote access options. May 22, 2015 - Went through these two earthquakes also . Learn more. While 'official' tallies of injuries and deaths are reported for each event, the … Traces T and C correspond to the high-resolution seismic 1:33. 'IHE EVEN!' 1987 Whittier Narrows Earthquake (SCEDC) 1988 Tejon Ranch Earthquake (SCEDC) 1988 Upland Earthquake (SCEDC) 1988 Pasadena Earthquake (SCEDC) 1989 Malibu Earthquake (SCEDC) 1989 Newport Beach Earthquake (SCEDC) 1989 Montebello Earthquake (SCEDC) 1990-1999 1990 Upland Earthquake (SCEDC) 1991 Sierra Madre Earthquake (SCEDC) Contrary to initial expectations of strike-slip or oblique-slip motion on the Whittier fault, whose north end abuts the aftershock zone, the focal mechanism of the mainshock showed pure thrust faulting on a deep gently … The moderate 5.9 magnitude blind thrust earthquake was centered several miles north of Whittier in the town of Rosemead, had a relatively shallow depth, and was felt throughout southern California and southern Nevada. WHITTIER NARROWS EARTHQUAKES -- Los Angeles County October 1 and 4, 1987 By F. HAROLD WEBER Jr., Geologist California Department of Conservation Division of Mines and Geology PHOTO 1 Photo 1. Most of the stations successfully captured the event, and the closest unit to the mainshock, a rock site at Garvey Reservoir, recorded a peak horizontal acceleration of .47g. Geophysics, Biological 1989: Various pagings: WH 362.5 WHI: Includes homeless population statistics, with recommendations for funding, programming, housing, and advocacy. *** Video courtesy of & copyright owned by TVNZ *** 1/ Broadcast (New Zealand): October 2nd, 1987. Whittier, Alhambra, and Pasadena are frequently mentioned in stories about the earthquake because that’s where most of the damage happened. [9], The National Strong-Motion Instrumentation Network (NSMIN) (a cooperative effort including the United States Geological Survey and other organizations) also monitored a set of 52 strong motion stations in the Los Angeles area. 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