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  • 1
    Electronic Resource
    Electronic Resource
    Analysis and automatic processing in near-field of eight 1992–1994 tsunamigenic earthquakes: Improvements towards real-time tsunami warning (1995)
    Springer
    Pure and applied geophysics 144 (1995), S. 381-408 
    Details
    ISSN: 1420-9136
    Keywords: Tsunami ; tsunami earthquakes ; seismic moment ; mantle magnitude
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract We study eight tsunamigenic earthquakes of 1992–1994 with data from single near-field 3-component long-period stations. The analysis is made from the standpoint of tsunami warning by an automatic process which estimates the epicentral location and the seismic moment through the variable-period mantle magnitudeM m . Simulations of early warning based on the real-time computation of the seismic moment are also tested with this system, which would give a justified warning in each region of tsunami potentiality. By exploiting the dependence of moment rate release with frequency, the system has the capability of recognizing both “tsunami earthquakes” such as the 1992 Nicaragua and 1994 Java events, as well as instances of the opposite case of low-frequency deficiency, interpreted as indicating a deeper than normal source (1993 Guam event). We report both the results of delayed-time processing of the near-field stations, and the actual real-time warnings at PPT, which confirm the former.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00874374
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  • 2
    Electronic Resource
    Electronic Resource
    Ocean cable measurements of the tsunami signal from the 1992 Cape Mendocino earthquake (1995)
    Springer
    Pure and applied geophysics 144 (1995), S. 427-440 
    Details
    ISSN: 1420-9136
    Keywords: Tsunami ; geopotential ; geomagnetism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The movement of the seawater across the earth's magnetic field produces a large-scale motional electric field. Using the Point Arena, California, to Hanauma Bay, Hawaii, unpowered HAW-1 cable, we have studied the geopotential across this distance to look for possible tsunami-induced fields that might have been produced following the April 1992 Cape Mendocino earthquake. We have used a ten-day interval prior to and including the earthquake as a reference for geopotential signals and for geomagnetic activity. We have also used geomagnetic data from Point Arena, Honolulu and Boulder as reference data. The results of the analyses show that there are tsunami-related effects in the cable geopotential data. These are (a) larger voltage prediction errors (residuals) for the interval following the main shock; (b) enhanced (compared to the 10d reference interval) geopotential spectral power following the main shock: two enhancements are larger than geomagnetically-induced spectral power enhancements in the same time interval; and (c) strong evidence for an ∼30 min “echo” in the cable geopotential signal following the main shock.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00874376
    Location Call Number Expected Availability
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    Paper (German National Licenses)
    Fulltext
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