Exciting news! We're transitioning to the Statewide California Earthquake Center. Our new website is under construction, but we'll continue using this website for SCEC business in the meantime. We're also archiving the Southern Center site to preserve its rich history. A new and improved platform is coming soon!

Near Field Investigations of the Landers Earthquake Sequence, April-July, 1992

Kerry Sieh, Lucile M. Jones, Egill Hauksson, Kenneth W. Hudnut, Donna Eberhart-Phillips, Thomas H. Heaton, Susan E. Hough, Kate Hutton, Hiroo Kanamori, Anne Lilje, Scott C. Lindvall, Sally F. McGill, James Mori, Charles M. Rubin, James Spotila, Joann M. Stock, Hong Kie Thio, Jerome A. Treiman, Brian P. Wernicke, & Judy Zachariasen

Published April 9, 1993, SCEC Contribution #25

The Landers earthquake, which had a moment magnitude (Mw) 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 Mw 6.1 preshock and Mw 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.

Sieh, K., Jones, L. M., Hauksson, E., Hudnut, K. W., Eberhart-Phillips, D., Heaton, T. H., Hough, S. E., Hutton, K., Kanamori, H., Lilje, A., Lindvall, S. C., McGill, S. F., Mori, J., Rubin, C. M., Spotila, J., Stock, J. M., Thio, H., Treiman, J. A., Wernicke, B. P., & Zachariasen, J. (1993). Near Field Investigations of the Landers Earthquake Sequence, April-July, 1992. Science, 260(5105), 171-176. doi: 10.1126/science.260.5105.171.