Near-field investigations of the Landers earthquake sequence, April to July 1992

TitleNear-field investigations of the Landers earthquake sequence, April to July 1992
Publication TypeJournal Article
Year of Publication1993
AuthorsSieh KE, Jones LM, Hauksson E, Hudnut KW, Eberhart-Phillips D, Heaton T, Hough SE, Hutton K, Kanamori H, Lilje A, Lindvall S, McGill SF, Mori J, Rubin C M, Spotila JA, Stock J, Thio H K, Treiman JA, Wernicke BP, Zachariasen J
JournalScience
Volume260
Pagination171-176
Date PublishedApr
ISBN Number0036-8075
Accession NumberWOS:A1993KW45200026
Abstract

The Landers earthquake, which had a moment magnitude (M(w)) of 7.3, was the largest earthquake to strike the contiguous United States in 40 years. This earthquake resulted from the rupture of five major and many minor right-lateral faults near the southern end of the eastern California shear zone, just north of the San Andreas fault. Its M(w) 6.1 preshock and M(w) 6.2 aftershock had their own aftershocks and foreshocks. Surficial geological observations are consistent with local and far-field seismologic observations of the earthquake. Large surficial offsets (as great as 6 meters) and a relatively short rupture length (85 kilometers) are consistent with seismological calculations of a high stress drop (200 bars), which is in turn consistent with an apparently long recurrence interval for these faults.