3rd Educational Seismology workshop in Nepal

Today is the 8th anniversary of the devastating 2015 Gorkha earthquake. Our educational seismology program, Seismo at School in Nepal, has held its first workshop in 2019, followed by several other, smaller activities during times of the pandemic restrictions. This year we are happy to be back with a full program and an in-person workshop in Pokhara, between May 1st and 3rd. Many thanks to the sponsors: EGU, IUGG and UNIL.

Devastating M7.5+ earthquakes in Turkey

A rare succession of two earthquakes larger than magnitude 7.5 has hit Turkey in just over 9 hours this morning. The first, M7.8 event was along the East Anatolian Fault, the second, M7.5 event occurred on a conjugate fault. Aftershocks continue and the number of casualties is still rising. Further seismological information can be found on KOERI’s website, on IRIS, on USGS, etc. An interview in French is available on heidinews.ch here (PDF).

Mise-à-jour 08.02.: article dans Le Temps sur la non-prédictabilité des séismes ici (PDF), explications sur la chaîne Canal9 ici (de 13’04” à 16’27”).

Mise-à-jour 09.02.: podcast sur la prévision des séismes dans Point J de la RTS ici.

Screenshot from KOERI’s website on 2023.02.06 at 20:10 UTC showing the earthquake events until then

Sismo-à-l’école à Martigny

Une nouvelle station du réseau Sismologie à l’école a été installé jeudi 26 janvier à Martigny. Le sismomètre mesure bien les variations du niveau de bruit entre la présence et l’absence des élèves, et a déjà détecté un premier petit séisme, de magnitude 1.4, qui a eu lieu samedi 28 janvier le matin, proche de la triple frontière Suisse-France-Italie. Cette nouvelle installation s’inscrit dans le cadre d’un Travail de Bachelor à l’Université de Lausanne (“Baccalauréat en géosciences et environnement“, orientation Géologie).

Enregistrement du vitesse du sol causé par le séisme à 20 km du sismomètre

DIVE DT-1B completed at 578.7 m depth

The first project DIVE borehole, located in Ornavasso, is now fully drilled, and reached 578.7 m depth below surface. All logging activities are completed for 2022. Both the core and the logging data recovery were very good. For a lookback at the past months activities, this page collects daily news and photos. The borehole is now sealed, as shown on the picture below, and preparation for the second borehole is ongoing.

Gotthard Base Tunnel gravimetric study published

With gravity measurements in the tunnel and on the surface along the tunnel, our study assessed the geological model of the Gotthard Base Tunnel, the currently longest tunnel in the world (57.1 km). It turns out that local and regional rock-density data explain the structure very well. Full details in our publication in Swiss Journal of Geosciences.

The locations of our new surface gravity measurement points along the track of the Gotthard Base Tunnel (view from South).

3-D seismological inversion method for crustal structure published

Following years of development, testing and validation, our new approach how to construct a crustal structure and shear-wave velocity model based on seismic receiver functions has just been published. The first part of the paper explains the methodology, the second applies it to the Central Alps and the AlpArray dataset. One key element is the new model parameterization, shown below.

The new model parametrization: layer boundaries are flexible in depth, velocities are defined twice at each discontinuity (below and above) allowing velocity jumps and also velocity gradients across layers.

DIVE DT-1b at 175 metres

Three weeks into the drilling phase of DT-1b, the hole’s current bottom is at 175 m below surface. There have been smooth and efficient days with night shifts, other days with more or less improvisation, rig change, minor fracture zone, and other adventures. The weekly shifts rotate and we look forward to a first logging session in the coming weeks.

Night-shift motivation and a promising core