Study of Selected Events in the Pamirs in a Seismic Discrimination Context

An investigation of the regional variations and frequency dependence of anelastic attenuation in the mantle under the United States in the 0.5-4 Hz band

“…On the other hand, observations of high-frequency energy in the 3-5 Hz range are quite common over a wide variety of teleseismic paths (Asada& Takano 1963;Takano 1971 ;Kurita 1968; Felix, Gilbert & Wheeler 197 1 ;Noponen 1975) if the observations were made using suitable instrumentation peaked at high frequencies and having suitable recording systems. A large number of worldwide spectral $ estimates are given by Der ef QI (1982), Sobel & von Seggern (1976Sobel et al (1977a, b), von Seggern & Sobel (1977 and von Seggern & Blandford…”

Analysis of Selected Seismic Events from Asia in a Seismic Discrimination Context

“…For these events the presence of negative and positive first motions at teleseismic distances, without any definite overall pattern, indicates that they are not thrust faults and that there is probably no common source mechanism for them (Sobel et al, 1977a). The phase pP was present on some of the LASA and NORSAR records.…”

“…Each of the regions is seismic; and they have therefore been extensively studied by Soviet seismologists (Medvedev, 1968). The Tien Shan, Pamir, and Caucasus earthquakes lie in distinct seismic regions, but all are undergoing uplift as a result of the collision of the Indian and Eurasian plates (Molnar and Tapponier, 1975 (Sobel et al, 1977a). The seismicity in the Caucasus…”

“…Sobel and von Seggern, 1976;Sobel et al, 1977aSobel et al, , 1977bSobel et al, , and 1977c, to identify the major source and path effects which impact upon discrimination of Asian events and to assess likelihood of correct event identification in these regions. However, the problem of regional effects can be circumvented by limiting the computation of a discriminant function for earthquakes and explosions to events within a geophysically distinct region.…”