Posts in the category »   «  ( 30 Posts )

Following an un-systematic post-dinner doomscrolling I’m happy to declare May 2022 as the trenchiest month ever. Here’s some exhibits:

Safety first; if cozy and comfy it’s better.

The award goes to Stéphane Baize (@Stef_EQ_Geology) and their trenches along the Cévennes fault: look at the details in the photo… like “paleo” engraved in the wooden frame to prevent collapse of the trench wall. And what about the tent? 10/10 professional style.

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Landscape photography award

The winner is Colca Canyon in Southern Peru, take a look at the pictures by Anderson Palomino (@AndersonRPT1) and Carlos Benavente (@clbenavente)

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Best flower structure award

No doubts here, easy win for Ian Pierce (@neotectonic) and their trenches in Azerbaijan. Follow him for stunning field photos and videos.

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Mud club

Mention goes to Jade Humprey (@ForFaultsSake).

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The tricks of the trade.

Learn them from Jonathan Obrist-Farner (@guateologist) uncovering the mysteries of the 1976 Motagua rupture in Guatemala

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Category “You don’t need a trench to find good stratigraphy”.

Prize goes to Gabriel Easton Vargas (@geastonvargas) and paleotsunami research in semiarid Chile

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Category “Let’s the student do the work”.

Terrific exhibit by Shreya Arora (@shryaarora) trenching in the Himalaya region

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Never without a nijiri gama.

Award is won by Sambit Prasanajit (@SPrasanajit) and their sites in S. Korea

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Fancy fence

The winner is PhD student Argelia Silva Fragoso (@Argy_sf) from Insubria university, digging trenches in Central Italy

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Sorry if I missed someone, I wish you all a safe and fruitful field season!

This time we have a number of studies on historical earthquakes, active tectonics studies from all around the world, a view review and methods articles, and plenty of tsunami stuff. Make sure to check out the new book on the geological record of extreme waves! Enjoy reading and let us know in case we’ve missed something.

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Between 1885 and 1938, the northern Tien Shan at the border between present Kyrgyzstan and Kazakhstan experienced a remarkable series of five major earthquakes, exceeding M6.9 and reaching up to M ~ 8 (1885 Belovodskoe M6.9, 1887 Verny M7.3, 1889 Chilik M~8, 1911 Chon Kemin M8, and 1938 Kemino Chu M6.9). Combined, the seismic moments add up to almost moment magnitude 9, which is a significant amount of strain released in roughly 50 years and across an E-W stretch of less than 500 kilometers. Even more intriguing is the fact that the ruptured region is located more than thousand km north of the nearest plate boundary and associated India-Eurasia collision zone. The macroseismic areas of these earthquakes include the present-day capital of Kyrgyzstan, Bishkek (Frunze) and the former capital and still largest city of Kazakhstan, Almaty (earlier names Alma Ata and Verny).
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[Update 15 February 2017: Since Sascha is an author here now, the post was attributed to him.]
Greece is one of the main targets of RWTH Aachen’s Neotectonics & Geohazards group. They worked on paleo-tsunamis, active faults on the Peloponnese, in Attica, and on Crete, and on the application of terrestrial LiDAR and shallow geophysics for active tectonics research. In their latest paper, Sascha Schneiderwind et al. developed a methodology to aid paleoseismic trenching studies. They use t-LiDAR and georadar to better and more objectively characterise lithological units. His paper includes nice examples from Crete and from the famous Kaparelli Fault. Here is his guest blog: more

I am quite happy that our new paper has finally been published in GJI. We worked on a fault between Aachen and Cologne in Germany and found that there has been a surface rupturing earthquake less than 9000 years ago, and possibly not much older than 2500 years BP. The area is of interest also because in 1755/56 a series of damaging earthquakes hit Düren and its surroundings – these are the strongest historical events in Germany that we know of. The quakes were felt as far away as Berlin, Strasbourg, and London, yet there were no primary ruptures. “Our” quake must have been much stronger… more

A few weeks ago, Nadine Reitman (USGS) published an interesting paper about the use of Photogrammetry for Paleoseismic Trenching in BSSA. In this guest blog she shares her key findings and explains how to minimise errors without spending too much time measuring control points. Thanks Nadine!

Structure-from-motion (SfM) is now routinely used to construct orthophotos and high-resolution, 3D topographic models of geologic field sites. Here, we turn SfM on its side and use it to construct photomosaics and 3D models of paleoseismic trench exposures. Our results include a workflow for the semi-automated creation of seamless, high resolution photomosaics designed for rapid implementation in a field setting and a new error analysis of SfM models. more

Trenches are open all over the world, news on the next TSG meeting (in London), a landslide database visualisation, and more. Today is Friday and here are your links!

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And again it’s almost the start of a weekend! I collected some nice links for you, I hope you like them. Today is Friday and here are your links!

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In Mai 2013, Jim McCalpin’s field course on Field Methods in Neotectonics and Paleoseismology took place in Crestone, CO. Our friend Jack Mason from the Institute of Neotectonics and Natural Hazards of RWTH Aachen University took part and sent me this amazing video. They encountered a bullsnake in the paleoseismological trench! Surprisingly, the snake decided to climb out of the trench via the vertical wall.  more

I am currently in Greece for field work on faults in the vicinity of Athens. Sascha from RWTH Aachen University is doing his MSc. thesis on remote sensing, geophysical analyses, and mapping of some structures that we think could be active, and me and Ioannis are with him in the field for the first few days. Right on the first day we found some promising outcrops which we will map and check in detail during the next days. more