HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by CHOUDHURY, M. A. Articles by HOURI, A. Search for Related Content GeoRef GeoRef Citation

A low-cost observatory tape recorder

INSTITUT DE PHYSIQUE DU GLOBE UNIVERSITÉ DE PARIS 6, 75230 Paris, -CEDEX 05

Abstract

A new principle of recording earthquakes on magnetic tape by triggering is described. Utilizing the multiplex FM system, an ordinary tape recorder is run both as memory and as storage equipment. The recorder runs normally forward during a cycle of about 10 min. If no earthquake has triggered the system, the tape is rewound to its initial position; but if a seismic pulse surpasses the trigger level, the "rewind" function of the recorder is postponed, and every time this level is surpassed, a new period of postponement begins. Thus, a continuous and complete record of an earthquake is obtained.

This article has been cited by other articles:

				R. GIR, S. M. G. SUBHASH, and M. A. CHOUDHURY Investigation of crustal structure by the analysis of reverberation periodicities Bulletin of the Seismological Society of America, October 1, 1978; 68(5): 1387 - 1397. [Abstract] [PDF]

				B. P. AMBUTER and S. C. SOLOMON An event-recording system for monitoring small earthquakes Bulletin of the Seismological Society of America, August 1, 1974; 64(4): 1181 - 1188. [Abstract] [PDF]