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. (SACRAMENTO) Sunday marks the 30th anniversary of the 1987 magnitude-5.9 Whittier Narrows earthquake—reported to have caused $358 million in property damage (equivalent to about $760 million today). The 1987 Whittier Narrows earthquake occurred in the southern San Gabriel Valley and surrounding communities of southern California at 7:42 a.m. PDT on October 1. The 1987 Whittier Narrows earthquake occurred in the southern San Gabriel Valley and surrounding communities of southern California at on October 1. 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. Significant Earthquakes and Faults Chronological Earthquake Index Whittier Narrows Earthquake.
* The Whittier Narrows earthquake occurred about 12 miles east of Los Angeles on a previously unknown fault. The source of the October 1987 Whittier Narrows earthquake was determined to be the Puente Hills thrust system (unknown at the time) and could be identified by the fault-plane solution of the mainshock and aftershocks, fault-plane reflections (up to 8 km deep), and by high resolution seismic profiles at shallower depths. 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.
Nine of these stations are located on the Caltech campus, as illustrated in Figure 3, two are on the JPL campus, about 10 km
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 This earthquake occurred on a previously unknown, concealed thrust fault approximately 20 km east of downtown Los Angeles, California. The Whittier Narrows earthquake was REPORTS I409 Mapped sizes of other fault segments suggest that the system is capable of much larger (magnitude 6.5 to 7) and more destructive earthquakes. Seismic reflection profiles, petroleum wells, and relocated earthquakes reveal the presence of an active blind-thrust fault beneath metropolitan Los Angeles. For longtime Whittier residents, Oct. 1, 1987, is the day they’ll never forget.
The 1987 Whittier Narrows earthquake occurred in the southern San Gabriel Valley and surrounding communities of southern California at 7:42 a.m. PDT on October 1.
(SACRAMENTO) Sunday marks the 30th anniversary of the 1987 magnitude-5.9 Whittier Narrows earthquake—reported to have caused $358 million in property damage (equivalent to about $760 million today). It was 7:42 a.m. when the 5.9-magnitude Whittier Narrows earthquake struck.
The 1987 Whittier Narrows earthquake occurred in the southern San Gabriel Valley and surrounding communities of southern California at 7:42 a.m. PDT on October 1.
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. [2] The Whittier Narrows earthquake was located in the northeastern corner of the Los Angeles basin, halfway between the surface traces of the Raymond and Whittier faults.
The 1987 Whittier Narrows earthquake probably occurred on the Elysian Park thrust which underlies the Santa Monica Mountains anticlinorium. array recorded the October 1, 1987 Whittier Narrows earthquake and its major aftershock on October 4, 1987, for a total of 87 channels of recorded data.
The magnitude 5.9 earthquake was originally assigned a magnitude of 6.1 but was revised downward a few days later when additional data became available. that the causative fault is a gently north-dipping thrust fault with an east-west strike that is located at depths from 11 to 16 km. The moderate 5.9 magnitude blind thrust earthquake was centered several miles north of Whittier in the town of Rosemead, had a relatively
A segment of this fault likely caused the 1987 Whittier Narrows (magnitude 6.0) earthquake.