r/geophysics

JMA confirmed no changes in volcanic monitoring data after the June 26th M5.6 at 20km depth near Fujikawaguchiko. The agency issued a standard one-week caution window citing 10-20% historical frequency of comparable follow-up events.

The part missing from most coverage: the 2012 NIED study estimated magma chamber pressure beneath Fuji at 1.6 MPa following the Tōhoku earthquake — 16x the 0.1 MPa threshold associated with the 1707 Hōei eruption, which occurred 49 days after the M8.6 Nankai earthquake, well outside the standard monitoring window.

Full analysis with sources: https://youtu.be/l0A7xswu1sM?is=68d-VS0lv6j3tvTt

Im wondering as someone who worked as a geoph in a consultant/contractor company. What are the perks and downsides of working as a geoph in mining company? i.e bhp, rio, freeport..

On Wednesday evening, the ground southeast of Yumare ruptured in a magnitude 7.2 earthquake. Thirty-nine seconds later, before the first quake's waves had even finished crossing the country, a second, larger shock hit almost the same spot: magnitude 7.5.

That ordering is the strange part. In a normal sequence the biggest shock comes first and everything after is an aftershock. Here it ran backwards. The USGS called it a doublet: two comparable mainshocks, not a quake and its echo.

I wanted to understand how that actually happens, so I wrote a long piece working from the physics out to the tectonics, why one rupture can light the fuse on the next through static and dynamic stress transfer, why this particular coastline (the Boconó–San Sebastián–El Pilar system) was primed to fail, why the tsunami warning was issued and then cancelled within the hour, and why northern Venezuela has done versions of this in 1812, 1900, 1967, and 1997. The 1812 event, it turns out, may itself have been a doublet.

Every figure is sourced to the primary literature (Kagan & Jackson on doublet statistics, King/Stein/Lin on Coulomb stress, the GPS and InSAR work on El Pilar creep), and I've tried to be careful about what's confirmed versus what's still preliminary this early after an event.

Hola, alguien por acá ha usado o conoce el sismógrafo multicanal WZG-24C de la empresa china Chongqing Gold Mechanical & Electrical Equipment Co., Ltd. Lo quiero para estudios geotécnicos de Vs.

Cualquier datos que me puedan dar será de mucha ayuda.