The Cretaceous shale intervals of Talhar and Sembar Formations – distributed in the Lower Indus Basin Pakistan are organic-rich shales that can act as gas plays. Two-dimensional seismic using synthetic modeling has been carried out Khewari oil field to identify petroleum This work was completed with help eight processed migrated lines. Based on structural interpretation different geological str...

INTRODUCTION IN 1953, through cooperation of the Bernard Price Geophysical Institute of the University of the Witwatersrand and the University of Natal, a Columbia University-type long-period seismometer (To = 15 sec., Tg = 75 sec.) was installed in the seismological observatory of the University of Natal at Pietermaritzburg, Union of South Africa. This instrument was well situated for receivin...

The AN-Lamer method is one of the cheapest methods for synthetic seismograms in irregularly layered media. In this article, we propose a new approach for a two-dimensional S H problem, solved originally by Aki and Lamer (1970). This new approach is not only based on the Rayleigh ansatz used in the original AkiLamer method but also uses further information on wave fields, i.e., the propagation i...

Abstacto We present a correction to a paper by Data Okal and Anderson (1975) about multiple ScS travel-time anomalies. We have reanalyzed data We use the same data as O&A; two deep Peruvian for ScS 2 surface bounces in the South Atlantic events recorded at two South African WWSSN Ocean. From these data n ScS2-S residual of 2Bi6 stations. In addition,we also use seismograms seconds was found by ...

We have investigated energy amplification observed within Greater Los Angeles basin by analyzing regional waveforms recorded from several Nevada Test Site (NTS) nuclear explosions. Although the stations are located nearly at the same azimuth (distances ranging from 350 to 400 km), the seismograms recorded in Compton (the central part of the basin), Long Beach (the southern edge of the basin), a...

We present a source model for the beginning of earthquakes based on the Griffith's fracture criterion. The initial state is a critical state of pre-existing circular fault, which is on the verge of instability. After the onset of instability, the fault grows with a progressively increasing rupture speed, satisfying the condition of fracture energy balance at the crack tip. We investigate the di...