OROG3NY

General knowledge of geoscientists holds that earthquakes occur on faults, and faults are created by brittle failure. But how good is the spatial correlation between the two datasets? This is the question we have analyzed from various sides in our freshly published paper.

Our work on the seismotectonic interaction between the Bhutan Himalaya and the Shillong Plateau has just been published in Tectonophysics. The results point to a weaker interaction between thrust faults in the two regions than previously suggested. Earthquakes on these thrusts mostly affect strike-slip faults connecting the two regions, so there is no “stress shadow” effect from the 1897 earthquake on the Bhutan Himalaya.

The first paper of the Eastern Alpine Seismic Investigation (EASI) project, discussing the crustal structure using various approaches based on receiver functions, has been accepted for publication in Tectonophysics. The final version is now online. EASI is an AlpArray Complementary Experiment, carried out by IG Prague, U Vienna, ETH Zurich and U Lausanne. EASI data will be open to the public in Autumn 2018.

An earthquake in the early morning in central Nepal is recorded by the Raspberry Shake 1D seismometer installed in a school in western Nepal. The epicenter is ~150 km far from the school, where P and S waves are clearly visible as in the following waveform. This seismometer belongs under the framework of ‘seismology-at-school in Nepal’ program, which is installed in May 2018 and conducting by Institute of Earth Science, the University of Lausanne with the aim of education and crowdsourcing.

This week the program CQFD on RTS has scheduled a detailed discussion on project AlpArray. You can listen to the interview by Silvio Dolzan with György Hetényi here.

In the first weeks of June a combined gravity and seismology field campaign was lead by Matteo Scarponi in the Ivrea-Verbano zone, helped by a changing team for new energy input. The environmental conditions were demanding: heat, thunderstorm, rain, hale, fog, snakes, scorpions, ticks, landslide, fallen tree, and other “surprises”. Luckily we’ve also met helpful people, could do a few key measurements during short hikes, and seen nice landscapes.

In the frame of Shiba Subedi‘s PhD thesis, the first low-cost seismometer was installed in a Nepali school this month. It is located west of Pokhara, not far from the rupture zone of the 2015 Mw7.8 Gorkha earthquake. The Raspberry Shake instrument is online and the data can be observed here.

In the canton Valais, the year 2018 focuses on risks. In this frame the transdisciplinary artist association Le Cairn organizes a project called “Sur la faille” (On the fault). A first workshop between three scientists (presenting geology, earthquakes, and associated hazards and risks) and eight artists (working on various representations of these themes) took place on May 5-6 in and near Sion, and in the gîte là-oh. The exchange was intense, and we look forward to see the art pieces in September!

The paper describing the AlpArray Seismic Network is  now published in Surveys in Geophysics (open access).

On this occasion the Swiss National Science Foundation has issued a press release, which you can read here in English, German and French.

Subsequent media appearances:

• FR: Rhône FM (read, listen: 30.04 at 17:02:43, 18:07:56, 19:03:31), Le Matin, Le Nouvelliste, 20minutes, …
• DE: NZZ, Die Zeit, Aargauer Zeitung, Südostschweiz, SRF4, Deutschlandfunk, Wormser Zeitung, alpin.de, Volksblatt.li, …
• IT: ANSA, meteoweb, La nuova ecologia
• EN: phys.org, …
• CZ: Tyden, 21.stoleti, Ceske noviny, Radio Praha
• SL: StaKrog, Primoski dnevnik
• HU: sg.hu, korkep.sk, veol.hu

Between April 9 and 13 the EGU General Assembly will gather a large number of geoscientists in Vienna. The conference program is available here, our group will contribute on every day except Tuesday. There will be two sessions of close interest for orogeny, one on the Himalayas, and one on the Alps.