Read on Twitter
Geoscientists in the field found surface rupture for Nov 11 #earthquake near Montélimar. Surprising for a M5 earthquake, but this 1 seems very shallow (e.g. #InSAR: https://twitter.com/RaphaelGrandin/status/1194393834987364354?s=20)
Tentative hypothesis linking it to quarry activity nearby is envisaged (= induced event ?)
Tentative hypothesis linking it to quarry activity nearby is envisaged (= induced event ?)
About the tiny (centimeters) surface rupture observed in the field read @BertrandDelouis thread https://twitter.com/BertrandDelouis/status/1194611511542603776?s=20
Few more explanation on induced earthquake hypothesis (not demonstrated at all yet):
- Reverse fault dipping SE, thus right below the quarry
- removing rocks in quarry would reduce normal stress, thus enabling rupture on fault loaded by compressive horizontal tectonic stress 1/
- Reverse fault dipping SE, thus right below the quarry
- removing rocks in quarry would reduce normal stress, thus enabling rupture on fault loaded by compressive horizontal tectonic stress 1/
It's because the very shallow (few kms) earthquake source is so uncommon for natural earthquakes that the induced (better say triggered ?) event hypothesis is tentatively considered.
Seismological hints for very shallow earthquake rupture https://twitter.com/BertrandDelouis/status/1194265672290852864?s=20
Other views of the French M5 #earthquake rupture in the field, cutting across small road, W of Montélimar https://twitter.com/stef92320/status/1194687708418990080?s=20
Will end this thread for tonight with this fine display of #InSAR results (shallow #earthquake W of Montélimar, Rhône valley, France) https://twitter.com/SotisValkan/status/1194539703858606080?s=20
