A short-lived flashflood in Rishi and Dhauli Ganga rivers on 7th February 2021, Uttarakhand Himalaya, killed 65 people with 141 reported missing (official estimate) and devastated two hydropower projects. Geomorphological observations supported by meteorological data suggest that the flood was triggered by a combination of avalanche and debris flow. The Dhauli Ganga valley has preserved ponded sedimentary sequences (laminated sand and silty-clay), suggesting that the valley is prone to episodic mega foods in the recent geological past. Considering that the receding glaciers in the higher Himalaya have left behind enormous sediment, unusual weather events are likely to generate such disasters more frequently as the climate becomes warmer. Thus, the study calls for not only incorporating the disaster risk assessment in the developmental planning of the Himalayan region but also recommends routine monitoring of the potential areas of structural failures in the glaciated valleys along with supra-glacial lakes.

Sadrabadi and Zilphi villages of Dharni Taluka in Amravati district, Maharashtra, experienced small magnitude earthquakes between September 1, 2018 and December 9, 2018. We deployed a four station temporary network of three component broadband seismographs to understand and characterize the earthquake sequence. We find that the short lived (${\sim}$2 months) micro-earthquake (M $\leq$2.4) swarm, accompanying rumbling sound, was highly clustered (3$\times$3 km$^{2}$) and occurred at extremely shallow depth (<0.4 km). Analysis of the data reveal that the earthquake swarm might have been induced by the percolation of monsoonal rainwaters (reaching (${\sim}$100 mm/day) through the cracked volume of soil/rock, associated with the fault system of the Narmada Son failed rift region. Besides revealing the science of earthquake swarm and characterizing it, the monitoring of earthquake swarm and its analysis contributed significantly in reducing the public panic.

$\bf{Highlights}$

$\bullet$ We report a case of monsoonal rainfall induced earthquakes from the Narmada Son failed rift region in Amravati district.

$\bullet$ The earthquake sequence is referred here as an earthquake swarm.

$\bullet$ The near surface shallow focused micro earthquakes (M$\leq$2.4) occurred in a small region (3$\times$3 km$^{2}$) immediately after the monsoon of 2018.

$\bullet$ Monitoring of such sequence is important to declare whether the sequence is a swarm activity that may not lead to the occurrence of a strong earthquake in the region.