Short Sequence of Small Earthquakes in the Andean Valley of Zongo

Abstract

Research Article| June 01, 1969 Short Sequence of Small Earthquakes in the Andean Valley of Zongo Luis M. Fernandez; Luis M. Fernandez San Calixto Observatorio, La Paz, Bolivia Search for other works by this author on: GSW Google Scholar Jamie Santa Cruz Jamie Santa Cruz San Calixto Observatorio, La Paz, Bolivia Search for other works by this author on: GSW Google Scholar Seismological Research Letters (1969) 40 (2): 27–48. https://doi.org/10.1785/gssrl.40.2.27 Article history first online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation Luis M. Fernandez, Jamie Santa Cruz; Short Sequence of Small Earthquakes in the Andean Valley of Zongo. Seismological Research Letters 1969;; 40 (2): 27–48. doi: https://doi.org/10.1785/gssrl.40.2.27 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietySeismological Research Letters Search Advanced Search Abstract It is well known that large earthquakes are accompanied by a series of smaller shocks. The characteristics of these series depend on the magnitude and focal mechanism of the main event. The relation between the main shock and the following aftershocks is well known from the study of many series of earthquakes, in such a way that the study of these phenomena may be the basis to study the mechanism of earthquake activity in a given area.In the present study the main shock of the series detected in the Andean Valley of Zongo the first of April 1967, had a magnitude of 4.6 in the unified magnitude scale of Richter. This shock was preceded by three foreshocks and followed by at least sixteen small aftershocks.The analysis of the time distribution of the events and their relative magnitude indicates a rather small number of minor magnitude events, indicating that the status of equilibrium of the region was reached almost completely by means of the main shock. The energy associated with the main shock is about two hundred times the total energy released by all the other small events put together. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.