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Earthquake hazard in new England.

A F Shakal, M N Toksöz

    Science (New York, N.Y.)
    |January 14, 1977
    PubMed
    Summary
    This summary is machine-generated.

    Southern New England experienced higher earthquake activity from 1725-1824 than in the following century. This seismic hazard analysis estimates a return period of 25 years for intensity VI+ earthquakes.

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    Area of Science:

    • Seismology
    • Earthquake Hazard Analysis
    • Geophysics

    Background:

    • Historical seismic data for Southern New England from 1725-1974 was analyzed.
    • Earthquake occurrences in the region showed temporal variations, with higher activity noted between 1725 and 1824.

    Purpose of the Study:

    • To calculate earthquake return periods and occurrence probabilities for Southern New England.
    • To assess the seismic hazard considering historical earthquake data.

    Main Methods:

    • Analysis of available seismic data spanning 1725-1974.
    • Calculation of mean interoccurrence times for earthquakes of varying intensities.

    Main Results:

    • Earthquake activity in Southern New England was not constant, exhibiting higher rates in the early period (1725-1824).

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  • The estimated return period for earthquakes of intensity VI or greater is 25 years.
  • The estimated return period for earthquakes of intensity VIII or greater is 130 years.

    • Conclusions:

    • Temporal variations in seismic activity introduce significant uncertainties in earthquake hazard calculations.
    • The study provides quantitative estimates for earthquake return periods in Southern New England.