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).