The 3 December 1988, Pasadena earthquake (M_L = 4.9) recorded with the very broadband system in Pasadena

Abstract

Since 1 December 1987, a very broadband seismographic system has been in operation at the Kresge Laboratory of the California Institute of Technology. This system consists of the Streckeisen-1 very broadband sensor (Wielandt and Streckeisen, 1982), the Kinemetrics FBA-23 triaxial force balance accelerometer and a Quanterra data-logger with a 24-bit (for Streckeisen-1) and a 16-bit (for FBA-23) digitizer. The details of the data logger are described in Steim (1986). The overall dynamic range of this system is about 200 db. This system was constructed as a joint project between the California Institute of Technology, the U.S. Geological Survey, the University of Southern California and the International Research Institution for Seismology (IRIS), and is an element of the IRIS global network as well as the TERRAscope network of California Institute of Technology. A brief description of the system is given by Given et al. (1989).