Abstract
We propose, on the basis of recordings of 94 Pacific interplate earthquakes by the PPT station situated in the Central South Pacific, a new method for the rapid determination of the seismic moment, by simply using the amplitude of the long periods of the vertical component of Rayleigh waves; we define experimentally, a Magnitude scale Mm, directly proportional to the decimal logarithm of the moment and to the energy released by the earthquakes. This new magnitude scale, which takes account of the longest Rayleigh wave perods must not sustain, as with Ms, the saturation effect which occurs when the length of rupture of the fault is superior to the wavelength used to determine the magnitude. Computation of the Mm magnitude takes into account the geometrical spreading and anelastic attenuation. Attenuation coefficients are regionalized by blocks of 10 X 10 degrees. For the Pacific, one uses the group velocities and quality coefficients of four different age models.
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© 1988 D. Reidel Publishing Company
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Talandier, J., Reymond, D. (1988). A New Approach for a Quick Estimation of the Seismic Moment, Magnitude Mm?. In: El-Sabh, M.I., Murty, T.S. (eds) Natural and Man-Made Hazards. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-1433-9_8
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DOI: https://doi.org/10.1007/978-94-009-1433-9_8
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-7142-0
Online ISBN: 978-94-009-1433-9
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