An evidence for earthquake occurrence time related with geologic structure — Relations between local mean lunar times of earthquake occurrence and their fault trends |
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Authors: | Rong-Hua Chen Jian-Hai Ding and Xiang Ding |
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Institution: | (1) Center for Analysis and Prediction, State Seismological Bureau, 100036 Beijing, China |
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Abstract: | The relation between the local mean lunar time τ of earthquake occurrence and their fault trends is studied in this paper.
The local mean lunar times τ of 53 earthquakes in 24 groups are calculated. Because the tidal generation force arisen by the
moon is a cyclic function of about 12 hours 25 minutes in the main, the two tidal generation forces anywhere in the earth
arising by the moon are equal in general when the moon lies to the two sites of 180° interval of local mean lunar time. Based
on this phenomenon the values Δτ of τ1–τ2 or τ1–τ2 ± 180° of two earthquakes occurring repetitiously in the same place are also calculated. The calculated results show that
if the fault trends of the two earthquakes in the same place is near, the Δτ is usually smaller and if the fault trends of
the two ones is not near, the Δτ is usually larger and the distribution of the local mean lunar time τ of earthquakes in different
places is dispersive even if fault trends of these earthquakes are near, and the τ does not concentrate on the lower and upper
transit of the moon. The above phenomena clear up that the triggering earthquake of earth solid tide arisen by the moon is
relative with the fault trends of earthquakes and we ought to think over the difference of environmental conditions of earthquake
preparation of each seismogenic zone and can not make statistics to earthquakes in different places when we study the relation
between the solid earth tide arisen by the moon and earthquakes. |
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Keywords: | fault trend Earth tide earthquake triggering |
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