Propagation of Lg Seismic Waves in the Soviet Union
This report summarizes the data on the Lg phase, a seismic wave-train with periods between 0.5 and 6 sec transmitted in the continental crust with a group velocity of 3.44 to 3.57 km/sec, propagating in the Soviet Union and nearby areas. Amplitude-distance curves and amplitude-distance correction factor data used in determining the magnitudes of Lg are given. The available travel time data, including the standard travel times of Lg, are summarized. Analysis of the efficiency of propagation of Lg by Soviet seismologists shows that Lg propagates efficiently across the Indian shield, Tarim basin, and the Russian, Siberian, and Kazakh platforms. It propagates less efficiently along Tien Shan and the Himalayas. The Tibetan platform, central part of the Black Sea, and central and eastern parts of the Caspian Sea completely eliminate Lg. 62 pp.
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absence of Lg Altay-Sayan amplitude curves amplitudes of Lg Black Sea Bodon body waves boundaries broadband SK Caspian Sea ChISS seismograph system ChISS system Cisbaykal crust crustal earthquakes curves of body curves of Lg determined earthquakes recorded efficiency of propagation energy class frequencies given in Table granitic layer group velocity Indian shield indicator magnification km Fig km/s Lena River Lg and Rg Lg phase Lg propagating Lg recorded North Tien Shan Novosibirsk numbers Pamir Mountains Pamir-Lena River profile Pasechnik paths characterized phases recorded plotted in Fig propagation of Lg Rand recorded by seismographic recorded by short-period regions sector seismic wave seismo seismograms of earthquakes seismographic stations located shear wave short-period SKM-3 seismographs shown in Fig SK seismographs Soviet Central Asia Soviet Union spectra of Lg spectral amplitude spectral amplitude-distance curves Talgar station Tbilisi Tibet Tibetan plateau TNT explosions travel time curves unspecified velocity amplitude spectra Vremennaya station