by A. Shakal, C. Petersen, R. Darragh, M. Huang, R. Nigbor and K. Madura
Shakal, A., C. Petersen, R. Darragh, M. Huang, R. Nigbor and K. Madura (1996). Recovery of Records from Code-Required Accelerographs after the Northridge Earthquake. SMIP96
Seminar on Seismological and Engineering Implications of Recent Strong-Motion Data, p. 53 - 70.
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The Northridge earthquake provided the first case since the 1971 San Fernando earthquake of effective recovery,
processing, use and analysis of data from accelerographs installed in buildings to meet local code requirements.
A large number of records were recovered from these accelerographs in an effort funded by the California Strong
Motion Instrumentation Program and the National Science Foundation, with Agbabian Associates coordinating and
managing field recovery. The records were valuable to assist post-earthquake structural evaluation and form an
important complement to data from regular networks. Significant aspects of the code data recovery, processing and
analysis are reviewed. Lessons learned from this experience with code instruments are reviewed to improve the success
in future events. Recommendations include increasing the documentation of the location, orientation, and maintenance
of code-required instruments, and shifting from film to digital recorders for new installations. Also, a goal of
increased adoption of the Uniform Building Code (UBC) instrumentation code requirement by cities and counties is
discussed. CSMIP will assist city and county code-instrument programs by providing technical and monitoring expertise.