Jammu and Kashmir Seismological NETwork (JAKSNET) earthquake catalogue (2014-2017)

In the NW Himalaya, the region between the 1905 Kangra and 2005 Kashmir
earthquake rupture zones is known as the Kashmir 'seismic gap'.
We established the Jammu and Kashmir seismological NETwork (JAKSNET) in
2013 to study the seismicity in this 'gap'. Continuous
ground-motion data from JAKSNET between 2014 and 2017 has been used to
detect and locate 1064 events. This is followed by accurate P- and S-wave
phase arrival-time picking and relocation using a probabilistic non-linear
location method. These yielded 360 well-located local earthquakes have
magnitudes of 0.6--4.7 and source depths of 0-60~km. This dataset consists
of (a) the phase arrival-times of these local earthquakes and (b) the
earthquake location catalogue.  The majority of these earthquakes
are shallower than 20~km and are clustered beneath the Jammu-Kishtwar
Higher-Himalaya. They originated on or above the Main Himalayan Thrust
(MHT), a fault zone which separates the underthrusting Indian crust from
the overriding Himalaya. The distribution of the clustered seismicity
illuminates structural heterogeneities on the MHT, which could
influence rupture initiation and propagation of future large earthquakes.

在喜马拉雅西北部，1905年坎格拉地震与2005年克什米尔地震的破裂带之间的区域被称为克什米尔‘地震空区’。我们于2013年建立了查谟和克什米尔地震台网（Jammu and Kashmir seismological NETwork, JAKSNET），以研究该‘空区’内的地震活动。我们利用2014至2017年间JAKSNET获取的连续地面运动数据，检测并定位了1064个地震事件。随后，通过概率非线性定位方法，对这些事件开展了精准的P波、S波震相到时拾取与重定位工作，最终得到360个定位精度良好的区域地震事件，其震级范围为0.6至4.7，震源深度介于0至60千米之间。本数据集包含两部分内容：(a) 上述区域地震的震相到时数据，以及(b) 地震定位目录。这些地震中绝大多数震源深度小于20千米，且集中分布在查谟-基什瓦尔高喜马拉雅带下方区域。它们均发生在主喜马拉雅逆冲带（Main Himalayan Thrust, MHT）之上或其附近；该断裂带将俯冲到下方的印度地壳与上覆的喜马拉雅构造带分隔开来。集中地震活动的分布特征揭示了MHT上的构造非均质性，这类非均质性可能会影响未来大地震的破裂起始与传播过程。