...Kuo-Fong Ma; Hiroo Kanamori Abstract The Sierra Madre earthquake ( M I = 5.8) of 28 June 1991 occurred at a depth of about 12 km, on the Clamshell-Sawpit fault in the San Gabriel Mountains. High-quality seismograms were recorded with TERRAscope not only for the mainshock but also...

...Egill Hauksson Abstract The ( M L 5.8) Sierra Madre earthquake of 28 June 1991 occurred at a depth of 12 km under the San Gabriel Mountains of the central Transverse Ranges. Since at least 1932 this region had been quiescent for M ≧ 3. The mainshock focal mechanism derived from first-motion...

..., for six earthquakes, the 1989 Montebello earthquake ( M L = 4.6), the 1989 Pasadena earthquake ( M L = 4.9), the 1990 Upland earthquake ( M L = 5.2), the 1991 Sierra Madre earthquake ( M L = 5.8), the 1992 Joshua Tree earthquake ( M L = 6.1), and the 1992 Landers earthquake ( M w = 7.3), are about 10...

... earthquakes of 1989, the M 5.5 Upland earthquake of 1990, and the M 5.8 Sierra Madre earthquake of 1991, with epicenters of 10, 55, and 40 km away from the recorder site SCS located in the northern Los Angeles basin, respectively. We did not observe significant variations of shear-wave splitting at SCS before...

... D. (1991) . Source parameters of the Sierra Madre earthquake from regional and local body waves , Geophys. Res. Lett. 18 , 2015 - 2018 . Frankel A. Vidale J...

... June 1991 Sierra Madre earthquake is presented as a test case for this concept. A single-station inversion of the record from the Pasadena station 20 km SW of the epicenter produces reasonable source parameters for the event. With these source parameters and a library of Green's functions calculated...

... of the Northridge, 17 January 1994, and Sierra Madre, 28 June 1991, earthquakes, our inversion of intensity is able to retrieve kinematic information on the sources that is in reasonable agreement with seismographic measurements. In Figure 3, however, it appears doubtful that our kinematic algorithm might be useful...

...Stephen Hartzell; Stephen Harmsen; Arthur Frankel; David Carver; Edward Cranswick; Mark Meremonte; John Michael Abstract Ground-motion records from aftershocks of the 1994 Northridge earthquake and mainshock records from the 1971 San Fernando, 1987 Whittier Narrows, 1991 Sierra Madre, and 1994...

... - S192 . Hauksson E. (1994) . The 1991 Sierra Madre earthquake sequence in southern California: seismological and tectonic analysis , Bull. Seism. Soc. Am. 84 , 1058 - 1074 . Hauksson E...

... functions are convolved with the corresponding rays, and the results are summed to form the total response. A simple application of the above method is demonstrated with the tangential motions observed from the 1991 Sierra Madre earthquake. For this event, we constrain the fault dimension to be about 3 km...

...Figure 2. Map of the easternmost 20 km of the Sierra Madre fault between Azusa and the San Antonio Canyon lateral ramp (location in Fig. 1 ). Traces of Sierra Madre fault are based on our analysis of 1928-, 1938-, and 1952-vintage aerial photographs (1:20,000 scale) except as noted. Locations...

... of a typical earthquake sequence of different magnitude. Figure 1 displays broadband and long-period records of the 1991 Sierra Madre earthquake and two of its aftershocks (Fig. 2). As can be seen, long-period noise tends to overwhelm the signal at about magnitude 3.5. To study small events, it is necessary...

... reveals large changes in k sn values (~60%) in the hanging wall of the Sawpit-Clamshell fault, where topographic elevations are also markedly higher than in the footwall ( Figs. 5B and 9B ). This observation is consistent with the 1991 M w 5.6 Sierra Madre earthquake on that fault ( Hauksson, 1994...

.... Helmberger D. V. (1991) . Source parameters of the Sierra Madre earthquake from regional and local body waves , Geophys. Res. Lett. 18 , 2015 - 2018 . Dreger D. S. Helmberger...