DIVE DT-1A at 315 m depth and on a break

The second project DIVE borehole, located in Megolo, is now at 315.3 m depth below surface, and prepared for a pause over the year end break. One of the last cores was a beautifully recovered 3-m-long piece of metagabbro, standing with two “columnar” (~stalwart) members of the project on the photo below. Other photos and daily news can be followed here; on-site activities are planned to resume in January 2024.

Uncertainty around an earthquake swarm in Hungary

“In August 2023, a series of earthquakes unprecedented in the Great Hungarian Plain began near the town of Szarvas. Several newspaper articles have made certain or almost certain claims about the events. However, understanding such a swarm of earthquakes requires much more data, geophysical modelling, and considerable research time. For this reason, and on the basis of what we know today, the probability of the earthquakes around Szarvas being related to human activity cannot be established with certainty.”

This is the English abstract of a study which appeared in Hungarian in the journal Magyar Tudomány (=Hungarian Science), available here.

Himalaya, Dynamics of a Giant

A book trilogy has been published this Summer as a result of a broad collaborative effort by geoscience experts working on the Himalayan mountain belt. The series has been edited by iSTE and co-published by Wiley, under the editorial work of Rodolphe Cattin and Jean-Luc Epard. Over a total of about 900 pages, the readers can read about:

The tip of the mantle-berg

The Balmuccia peridotite body in the Ivrea-Verbano Zone has been interpreted by geologists as a lense: an elongated outcrop of mantle rocks that is disconnected from the real mantle and brough to the surface by tectonics. Geophysical studies in the past have already stipulated that dense and seismically fast rocks, similar to the mantle, must be located at very shallow depth beneath the area (see Scarponi et al. 2020, 2021 for recent, larger scale studies). The most recent result on this question, based on targeted, active source seismic investigation, shows that the connection between the surface and the subsurface exists: the Balmuccia peridotite is the tip of the mantle-berg! For details, please read Ryberg et al. 2023 in GJI.

Figure 7a of Ryberg et al. 2023