Luca Malatesta

@geoluca.bsky.social

1353 Followers 612 Following

Geologist at GFZ and Tohoku University. Interested in all things tectonic and climatic geomorphology. https://www.gfz-potsdam.de/en/staff/luca.malatesta/sec47 ORCID https://orcid.org/0000-0003-0983-715X

California condor
An airplane panoramic view of Mt Fuji and surrounding. The summit is coated in white snow.
A de icing machine sprays the wing of an aircraft
The regular expression to split text into tokens before identifying and grouping changes. By Frederik Tilmann.
Time lapse of a sea of fog with distinct streams moving. Snowless Jura pasture in the background. Mont Blanc massive with little snow in the background.
The Noto Peninsula overlain with a shapefile of 4767 terrace units.
Two slope maps of the bathymetry around the Noto Peninsula and Sado Island highlighting the location of a nearshore scarp.
Map of the Noto Peninsula and Sado Island in Central Japan
Japan meteorological Agency map showing the shindo intensity.
screen shot of the Japan Meteorological Agency's tsunami advisory with added location of Kushiro and Ofunato
Noto coast in Nov. 2023. Waves come all the way up to a concrete embankment protecting a cliff
Train tracks and train In front of a building. Moving Train is rendered in three successive shots in R G and B.
(a) Location of the 188 KiK-net sites analyzed in this study (gray triangles) and the 13 sites with pronounced seasonal variation in ∆κ0 (highlighted triangles). The different colors indicate clusters of sites that respond differently to environmental change. (b) Zoom on the northeast corner of Hokkaido and (c) Honshu. The crosses indicate the locations of JMA weather stations.
Eastern Adriatic coast, with an outline of the large shallow water domain.
Satellite image of the Blatten collapse with permafrost extent as overlay. The unstable north-facing slopes of the Kleines Nesthorn that collapsed on the Birch glacier are mapped as "extensive permafrost"
an excavator at the confluence of the Lonza and the Rhone. Source: Pomona Media.
Fersen dammed lake kept at a low level. Source SRF/ Sandra Brand
There is still disagreement on the origin of the water that led to the debris flow, particularly to the first surge. Bonanomi and Keiser (2017) clearly mention meltwater from the entrained glacier ice as the main source, whereby much of the melting is assigned to impact, shearing, and frictional heating directly at or after impact, as is often the situation in rock-ice avalanches (Pudasaini and Krautblatter, 2014). WSL (2017) has shown, however, that the energy released was only sufficient to melt approximately half of the glacier ice. Water pockets in the glacier or a stationary water source along the path might have played an important role (Demmel, 2019). Walter et al. (2020) claim that much of the glacier ice was crushed, ejected, and dispersed (Fig. 30), whereas water injected into the rock avalanche due to pore pressure rise in the basal sediments would have played a major role. In any case, the development of a debris flow from a landslide mass with an overall solid fraction of as high as ~0.85 (considering the water equivalent of the glacier ice) requires some spatio-temporal differentiation of the water and ice content. We consider two qualitative conceptual models - or scenarios - possibly explaining such a differentiation:
A helicopter view looking downvalley across the debris deposit. Small lakes and surface drainage are visible on the surface.
A lake dammed by the debris from the collapse of the Birch glacier covering Blatten.
satellite image with a polygon showing the extent of the glacier collapse over the village of Blatten.
NOT VERIFIED, an approximate polygon drawn from media images shows the extent of the Birch glacier collapse above Blatten.
A 3D printed catchment to study sediment transport
A view of the mt st Michel with the sun behind
title page of the preprint titled “Earthquake faults recorded in the near-shore bathymetry of Japan's back-arc” by Luca Claude Malatesta , Shigeru Sueoka, Nina-Marie Weiss, Boris Gailleton, Sumiko Tsukamoto, Daisuke Ishimura, Naoya Ono Takahashi , Takuya Nishimura, Kyoko Kataoka, Tetsuya Komatsu, Yoshiya Iwasa
distribution of positive rock uplift rates derived from marine terraces in Japan, Looks like a lognormal distribution with a peak at 0.3 mm/yr and a shoulder interrupting the decrease at around 0.8-0.9 mm/yr.
Screenshot of the app Merlin showing multiple birds identified.
A satellite image of Kefalonia with two straight coasts connected by a 90º angle.
a topographic map of the Hokoriku and Niigata area with the coastline set at -120m below modern sea level.
Margarita K., 10th grade, speaking at a lectern for a presentation titled "Using Modern Software for Seismic Data Processing with Raspberry Shake.""
Out of focus sunrise behind grimy window
Picture of the Kornhausbrücke, Bern, Switzerland. A tram crosses the bridge Alpine peaks are visible behind the old roofs of the city.
Screenshot of the raspberryshake website showing the location of the Mw7.1 earthquake and that of stations in Eastern Europe. Data from the station at the University of Donetsk in Myrgorod (displaced by war) shows a high energy low-frequency domain from teleseismic waves.
Kristen Cook stands in front of a large screen where a title slide spells “Himalayan sediment bombs”
A geologist walks on a rock at the coast holding a measuring staff. The bottom 2/3 of the rock is painted white by dead algae that mark over 3 m of uplift.