长岛震群b值随深度变化特征

Abstract

Abstract: The Changdao earthquake sequence from February 2017 to May 2018 was relocated by using the double difference location method. According to the result of relocation, the variation of b value with depth in the seismic activity concentrating area in Changdao earthquake sequence is calculated. The results obtained show that the earthquake sequences can be divided into north and south concentrated areas. There is more earthquakes in the northern concentrated area with long time span. The number of earthquakes in the southern concentrated area is relatively small, and the formation time is relatively late. The focal depth is mainly concentrated in the depth between 4 and 25 km. The b values of the north and south concentrated areas decrease with depth. There is an upward trend in depth around 8.5 km. It is inferred that the stress is mainly affected by static pressure of surrounding rock, and the fault activity is less affected.

Key words: b Value, Double difference location, Changdao Earthquake Sequence

CLC Number:

P315.7

SHEN Jin-chao, LI Shi-cheng, ZHANG Bin. Variation of b Value with Depth in the Changdao Earthquake Sequence[J]. EARTHQUAKE, 2019, 39(2): 28-36.

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Variation of b Value with Depth in the Changdao Earthquake Sequence

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