RUPTURE KINEMATICS OF THE 3 GAZLI MAJOR EARTHQUAKES FROM VERTICAL ANDHORIZONTAL DISPLACEMENTS DATA

An inversion of horizontal and vertical displacement data in the Gazli region shows that the Gazli earthquakes of April and May 1976 and Mar ch 1984 occurred on variously orientated fault planes (dipping to the ESE, N, and ESE, respectively). The kinematics of the 1984 seismic rup ture exhibits a pure thrust slip motion of 2.5 m. Common data for dist inct events during the 1976 rupture sequence are not optimal to solve the rupture characteristics. However, the complexity of the faulting i s highlighted by (1) well-resolved different dips for the two shocks. (2) strike-slip components of motions on fault planes (with thrust-mot ion components close to the value of the 1984 event), and (3) discrepa ncy between geodetic and seismic fault models for the April 1976 earth quake. The results express the complex mechanics that drive compound i ntraplate earthquakes.