@jascha Btw, here is the link to page for this #solomonislands #earthquake on the #Geoscope web page, hosted by #IPGP, and that uses the #SCARDEC method developed by Martin Vallée: http://geoscope.ipgp.fr/index.php/en/catalog/earthquake-description?seis=us7000irfb

@SakuRainbow @earthjay Actually, the rounded parts show that the moment tensor is not 100% consistent with pure slip on a planar fault ("pure double couple"). But maybe 10% is unexplained. The rest can be due to 1/ uncertainty in the inversion, 2/ actual complexity of the rupture (multiple faults activated, roughness of the fault...) or 3/ volume change (e.g. when magma is involved). #SCARDEC assumes a pure fault plane, whereas #USGS leaves more freedom to inversion. See https://pubs.er.usgs.gov/publication/70020193

Here is the first event of 09 October 2022. #FocalMechanism determined with #SCARDEC method from #Geoscope #NationalService. This is a very deep earthquake, among the deepest that are detected (~650 km). These events occur at the depth where the subduction plane hits the boundary between upper and lower mantle. The event was actually a sequence of three ~M.6.5 events, which is already remarkable. Source: http://geoscope.ipgp.fr/index.php/en/catalog/earthquake-description?seis=us7000ingh