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experimental

Entry: Seismic moment

URI: https://terra-vocabulary.org/ncl/DataTerraRepositoryFairIncubator/motsClefs/c_1fee1bf9

Characterisation of the energy released by the earthquake as seismic waves. It is proportional to the fault surface and the mean slip. The seismic moment can be related to the moment magnitude.

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is a Concept | observable property
changed on 17 Nov 2023 08:31:48.230
submitted byHélène Bressan
accepted on 20 May 2022 09:42:08.211

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date accepted 20 May 2022 09:42:08.211
date submitted 20 May 2022 09:41:39.099
definition
entity Seismic moment
source graph graph

description
en The magnitude of the component couple of the double couple that is the point force system equivalent to a fault slip in an isotropic elastic body. It is equal to rigidity times the fault slip integrated over the fault plane. It can be estimated from the far- field seismic spectrum or waveform fitting at wavelengths much longer than the source size. It can also be estimated from the near-field seismic, geologic and geodetic data, and the consistency among various observations. This was first demonstrated for the Niigata, Japan, earthquake of 1964, supporting quantitatively the validity of the fault origin of an earthquake. Also called “scalar seismic moment” to distinguish it from moment tensor.
en Characterisation of the energy released by the earthquake as seismic waves. It is proportional to the fault surface and the mean slip. The seismic moment can be related to the moment magnitude.
fr Caractérisation de l'énergie libérée par le séisme sous forme d’ondes sismiques. Il est proportionnel à la surface de la faille rompue et à son glissement. On peut relier le moment sismique à la magnitude de moment.
item class observable property | Concept
label
en Seismic moment
fr Moment sismique
modified 17 Nov 2023 08:31:48.230
notation c_1fee1bf9
register mots clefs
status status experimental
submitter
account name h.bressan@brgm.fr
name Hélène Bressan

type register item
version info 7
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Definition

alt label Mo
description
en Characterisation of the energy released by the earthquake as seismic waves. It is proportional to the fault surface and the mean slip. The seismic moment can be related to the moment magnitude.
en The magnitude of the component couple of the double couple that is the point force system equivalent to a fault slip in an isotropic elastic body. It is equal to rigidity times the fault slip integrated over the fault plane. It can be estimated from the far- field seismic spectrum or waveform fitting at wavelengths much longer than the source size. It can also be estimated from the near-field seismic, geologic and geodetic data, and the consistency among various observations. This was first demonstrated for the Niigata, Japan, earthquake of 1964, supporting quantitatively the validity of the fault origin of an earthquake. Also called “scalar seismic moment” to distinguish it from moment tensor.
fr Caractérisation de l'énergie libérée par le séisme sous forme d’ondes sismiques. Il est proportionnel à la surface de la faille rompue et à son glissement. On peut relier le moment sismique à la magnitude de moment.
exact match c 4a19f4bd
in scheme Vocabulaire des mots clefs
label
en Seismic moment
fr Moment sismique
pref label
en Seismic moment
fr Moment sismique
same as c 4a19f4bd
source wats
top concept of Vocabulaire des mots clefs
type Concept | observable property
was attributed to Pôle FormaTerre