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An Earthquake Alarm System for the Maui A Offshore Platform, New Zealand

Tyler, R. G. and Beck, J. L. (1983) An Earthquake Alarm System for the Maui A Offshore Platform, New Zealand. Bulletin of the Seismological Society of America, 73 (1). pp. 297-305. ISSN 0037-1106.

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An earthquake alarm system for the Maui A Offshore Platform, which is situated in the Tasman Sea off the coast of New Zealand for the production of natural gas, is described. The function of the alarm system is to give an immediate warning when accelerations equal to half the design level for the platform have been reached in order that safety procedures can be initiated. The alarm system was designed to monitor only the response of the lower modes of the platform, as these would make the major contribution to the stresses in the platform. Ambient vibration measurements were performed which showed the values of frequency for the six lowest modes to be in the range of 0.45 to 1.35 Hz. The alarm system was accordingly designed so that the signal from the transducers passed through a filter with a nominally flat frequency response over a bandwidth 0.3 to 2 Hz with a sharp roll-off at 24 dB per octave at higher frequencies. A radio link with similar detectors on shore was arranged to give confirmation that an earthquake had occurred in order to reduce the risk of false alarms.

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Additional Information:Copyright © 1983, by the Seismological Society of America. Manuscript received 30 June 1982. The authors would like to thank the Board of Maui Developments Ltd. for permission to publish the results of the ambient vibration tests which were carried out in conjunction with P. R. E. Brown Ltd., Industrial Vibrations Consultant, of Auckland. The authors are also grateful for the cooperation of Solid State Equipment Ltd., of Lower Hurt, designers, and installers of the alarm system.
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:33735
Deposited By: Carmen Nemer-Sirois
Deposited On:04 Sep 2012 17:56
Last Modified:03 Oct 2019 04:12

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