The recognition of sedimentological traces of earthquakes in the form of seismites within Pleistocene sediments is the main objective of the GREBAL project (Recognition of traces left by earthquakes in Pleistocene sediments affected by glacio- isostatic rebound in the Baltic Sea Basin). The investigations focus primarily on Poland, Germany, Latvia, Estonia and Lithuania. Project leader Małgorzata (Gosia) Pisarska-Jamroży has summed up new results from this international research effort.more
Posts in the category » Field work « ( 122 Posts )
“The beaches in Oman are pristine.” What sounds like an introductory sentence to a tourist brochure has scientific significance. Natural conditions without anthropogenic overprint are characteristic for vast stretches along the 1700 km coastline of Oman from the Strait of Hormuz in the north to the border of Yemen in the south. This situation allows geological research addressing Quaternary sea-level change on various timescales spanning from minutes to millennia. Over the last couple of years, we carried out research funded by the Omani Government and the German Research Foundation (DFG). Our findings are currently published in a series of papers (Schneider et al. 2018; Ermertz et al. 2019; Falkenroth et al. 2019, subm.; Hoffmann et al. 2020a, b) and are briefly summarised here.more
There is a wonderful, amazing, extraordinary postdoc position open at Oxford University: Palaeoseismology of Central Asian Earthquake Ruptures.
We seek to appoint a postdoctoral research assistant to undertake investigations of large earthquakes within the interior of Asia. The post is part of a project funded by the Leverhulme Trust called EROICA. The successful candidate will work closely with Professor Richard Walker, and will join a vibrant community of active tectonics researchers in Oxford within the Earthquake Geology and Geodesy group.
The researcher will be responsible for the detailed mapping of palaeo-earthquake ruptures, the construction of slip distributions from individual earthquakes, the analysis of high-resolution satellite imagery, the construction of digital topographic models, and the selection of sites for long-term slip-rate determination using field investigation. The PDRA will also be involved in planning and carrying out fieldwork to verify remote-sensing observations, to collect samples for dating, and to excavate and interpret palaeo-seismic trenches. We expect the researcher to help in supervising doctoral and masters student research projects, in addition to undertaking their own research.
The Tien Shan takes up about 20 mm/yr of N-S shortening as a result of the India-Eurasia convergence. Recent paleoseismological studies have shown that the shortening is accommodated by a large number of faults, whose slip rates are relatively low. Although the historical earthquake catalogues only reach back a few hundred years, we know that the Tien Shan has seen some of the strongest intracontinetal quakes world-wide with magnitudes exceeding M8. Paleoseismological studies have revealed a large number of surface-rupturing earthquakes, too. But the question is: Do all these known faults rupture in strong earthquakes? In a recent paper, my colleagues and I argue that there is at least one major fault in the Northern Tien Shan that is creeping (Mackenzie et al., 2018). more
2018-04-21 | in Field work
A large landslide occurred in SE Kazakhstan near the town of Saty (Саты), TengriNews.kz reports. The slide is about 900 m wide, 1700 m long, and has an estimated volume of ~50,000,000 m³. Apparently nobody was harmed, but the now slow-moving landslide mass approaches Kolsai river. The road to Kolsai lake (a landslide lake) is blocked. Images and videos from the area show what may be a thick layer of loess that moved downhill after heavy rain. more
On 21 August an MD4.0 earthquake hit the Island of Ischia, Italy. The event occurred at a depth of only ~2 km. Despite the low magnitude, the earthquake had dramatic consequences, and two people were killed by collapsing houses. The INGV EMERGEO working group and CNR-IAMC have now published a report on the coseismic effects of this earthquake, which include ground cracks and mass movements. The full report can be found at earthquakegeology.com or downloaded as a pdf here (3.15 MB).
Please cite the report as: EMERGEO Working Group, Nappi et al. (2017). The august 21, 2017 Isola di Ischia (Casamicciola) earthquake: Coseismic effects, doi:10.5281/zenodo.1003188
Report on the International Field Trip “From 1997 to 2016: three destructive earthquakes along the Central Apennine fault system”, 19th-22nd July 2017, Italy
Website: http://convegni.unicam.it/TDEq_centralItaly ( including program and abstracts, field trip guidebook and list of participants)
Authors: Chiara Frigerio1, Alessandro Maria Michetti1, Francesca Ferrario1, Franz Livio1, Emanuele Tondi2
1Università dell’Insubria, Dipartimento di Scienza ed Alta Tecnologia, Como, Italia
2Università di Camerino, Sezione di Geologia, Scuola di Scienze e Tecnologie, Italia more
Paper: Using georadar and a mobile geoelectrics device to map shallow sediment distribution on a large scale
[UPDATE 2017-05-14: The links now lead to the free version of the paper, available until 30 June.]
Together with my colleagues I have published a new paper in which we describe a methodology for mapping the shallow architecture of large sedimentary basins with minimum effort and high resolution. We use two geophysical methods and combine them with point information from shallow drillings to identify different types of alluvial, fluvial, and aeolian sediments in the Orkhon Valley in Mongolia. We then show that our results fit well with a remote sensing approach. Although we did not target active faults in our study, the methodology is well suitable for detecting deformed/offset sediments without surface expression due to high erosion or sedimentation rates. That’s why I feel the study is of interest for the fault-hunting community. more
Active faults around Cusco (Perú): field work on paleoseismology and archaeoseismology for project Cusco-PATA2017-05-02 | in Field work | one response
The city of Cusco in Perú has been hit by damaging earthquakes several times in its long history. In Inka times a strong earthquake destroyed parts of the city, and the Spanish invaders documented an earthquake that happened in 1650. Three hundred years later, in 1950, an earthquake destroyed large parts of modern Cusco and in 1986 a M6.1 event also led to damages in the city. In order to better understand the active normal faulting in the region, INGEMMET has launched the project Cusco-PATA (Paleoseismology, Archaeoseismology and Active Tectonics – “pata” also means “scarp” in Quechua). The project brings together scientists from Perú, Spain, France, and the UK. The 2017 field campaign started in mid-April with work on the archaeological sites in and around Cusco and paleoseismological trenching of the Pachatusan Fault. more
An interesting post-grad student training course will be held from 26 June – 7 July, 2017, at Hokkaido University:Structural Geology and Tectonics of Hokkaido: Geometric principles, and the relationship between active and ancient deformation.During this course you will learn how geologic structures, developed from microscopic to map scale, reflect the rates, directions, and mechanics of past and contemporary plate tectonics and deformation. You will also hone your three-dimensional perception and skills through practical applications.