摘要(英) |
After Fu’’s research(2003),the characteristics of time distribution of small magnitude(3.0≦M≦4.0)earthquakes can be explained by gamma model.
The earthquake catalog of CWB,Taiwan is used in this paper,from 1973,Jan. to 2003,Jun.We divid the range of Taiwan(23°N~26°N,119°E~123°E)into 2000 small squares with 0.1°×0.1°.We chosse 6 big mainshocks with magnitudes greater than 6.0 from the CWB catalog.Then we calculate the changes of the number of earthquakes between one year after the mainshocks and five years before the mainshocks,and if the changes were greater than the standard value,the square will be taken as a part of the aftershock range.We calculated the parameters of gamma model of each mainshocks with several different time interval in 30 years,and then to check if any clustering phenomenons happened after the mainshocks. |
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