7. Triggered Seismicity and Borehole
Seismology
Under certain suitable geological conditions, anthropogenic seismicity
due to mining, geothermal and natural gas/oil production, filling of
artificial water reservoirs, and high-pressure fluid injection has been
reported globally. The
reservoir-triggered seismicity
(RTS) is most prominent, having been reported from hundreds of
locations, with at least five sites where earthquakes exceeding M 6
occurred, claiming human lives and destruction of properties. The most
important correlate for RTS to occur is the height of water column in
the reservoir. Certain common characteristics of the RTS sequences have
been identified, which discriminate them from normal earthquake
sequences. During the reporting period, it was documented for the first
time that the Injection Induced Seismicity (IIS) in Oklahoma, USA has
characteristics like RTS (Rekhapalli and Gupta, 2021). An Editorial on
Anthropogenic Seismicity (Gupta H.K., 2021a) and why Koyna is the most
suitable site for near field investigations of earthquakes (Gupta H.K.,
2021b, 2021c, 2021d, 2022b) were discussed in detail. It has been
discovered that the DVP is hosting all the three types of earthquake
sequences (Gupta H.K., 2022a).