Abstract Icequakes, microseismic earthquakes at glaciers, offer insights into the dynamics of ice sheets. For first time in Antarctic, we explore use fiber optic cables as Distributed Acoustic Sensors (DAS) a new approach for monitoring basal icequakes. We present DAS studying icequakes case study application to datasets other geological settings. Fiber was deployed on surface Rutford Ice Stream two different configurations. compare performance with conventional geophone network for:...

Abstract The Cenozoic convergence between India and Asia has created Earth's thickest crust in the Pamir‐Tibet Plateau by extreme crustal shortening. Here we study structure of Pamir western Tian Shan, adjacent margins Tajik, Tarim, Ferghana Basins, Hindu Kush, using data collected temporary seismic experiments. We derive, compare, combine independent observations from P S receiver functions. obtained Moho depth varies ~40 km below basins to a double‐normal thickness 65–75 underneath Kush. A...

Abstract Break-off of part the down-going plate during continental collision occurs due to tensile stresses built-up between deep and shallow slab, for which buoyancy is increased because continental-crust subduction. governs subsequent orogenic evolution but real-time observations are rare as it happens over geologically short times. Here we present a finite-frequency tomography, based on jointly inverted local remote earthquakes, Hindu Kush in Afghanistan, where slab break-off ongoing. We...

Abstract The slip of glaciers over the underlying bed is dominant mechanism governing migration ice from land into oceans, with accelerating contributing to sea-level rise. Yet glacier remains poorly understood, and observational constraints are sparse. Here we use passive seismic observations measure both frictional shear stress at Rutford Ice Stream in Antarctica using 100,000 repetitive stick-slip icequakes. We find that basal stresses rates vary 10 4 7 Pa 0.2 1.5 m per day, respectively....

Abstract We use the full waveform inversion method to study crustal‐mantle seismic structure beneath Central Asia. By combining earthquake waveforms and ambient noise cross‐correlations, we construct a 3D model of Vp Vs down depth 220 km. This reveals complex Indian‐Asian plate configuration interaction, resulting from subduction, indentation, break‐off. Beneath Hindu Kush, marginal Indian slab with its lower crust is successfully imaged, latter which hosts vigorous intermediate‐depth...

The eastern margin of the Adriatic plate stands out for its tectonic complexity and geohazard potential in Europe, which are dominated by northeast-directed subduction collision with Eurasian beneath Balkan. Beneath southern Dinarides (northern Albania), is believed to be shallower than 150 km whereas penetrates down 200 depth northern Hellenides (central Albania). Further south, Kefalonia transform fault system (KTFS, northwestern Greece) represent transition from continental oceanic Ionian...

The Pamir orogen, Central Asia, is the result of ongoing northward advance Indian continent causing shortening inside Asia. Geodetic and seismic data place most intense deformation along northern rim Pamir, but recent 7 December 2015, M w 7.2 Sarez earthquake occurred in Pamir's interior. We present a distributed slip model this using coseismic geodetic postseismic field observations. ruptured an ∼80 km long, subvertical, sinistral fault consisting three right‐stepping segments from surface...

Abstract Microseismicity, induced by the sliding of a glacier over its bed, can be used to characterize frictional properties ice‐bed interface, which are key parameter controlling ice stream flow. We use naturally occurring seismicity monitor spatiotemporally varying bed at Rutford Ice Stream, West Antarctica. locate 230,000 micro‐earthquakes with local magnitudes from −2.0 −0.3 using 90 days recordings 35‐station seismic network located ∼40 km upstream grounding line. Events exclusively...

Abstract On June 21st, a Mw6.2 earthquake struck the Afghan‐Pakistan‐border‐region, situated within India‐Asia collision. Thousand thirty‐nine deaths were reported, making deadliest of 2022. We investigate event's rupture processes by combining seismological and geodetic observations, aiming to understand what made it that fatal. Our Interferometric Synthetic Aperture Radar‐constrained slip‐model regional moment‐tensor inversion, confirmed through field reveal sinistral with maximum slip 1.8...

Myanmar is located south of the Eastern Himalayan Syntaxis, where tectonic activity driven by northward indentation Indian Plate into Asia and oblique eastward subduction India beneath western margin Burmese microplate. Dextral motion along Sagaing Fault separates eastern microplate from Asian Plate. The associated lithospheric structure complex three-dimensional, featuring a transition an oceanic-transitional slab to continental collision, likely involving plate tearing bending....

Abstract Seismologic and geologic fault‐slip data characterize the active deformation of intramontane Tajik basin its margins, Tian Shan, Pamir, Hindu Kush at northwestern tip India‐Asia collision zone. Within this complexly deforming region, lithosphere forms backstop for north‐dipping Indian‐slab subduction beneath but itself delaminates retreats west northward Pamir. Herein, we link crustal to these lithosphere‐scale processes, using from recently deployed seismic networks observations....

Abstract The Tajik basin and southwestern Tian Shan constitute the northwestern tip of India‐Asia collision zone. Basin inversion formed thin‐skinned fold‐thrust belt, outlined by westward convex fold trains, underlain a décollement in Jurassic evaporites. belt's leading edge—the Uzbek Gissar—and its transpressional northern lateral margin—the Gissar—constitute thick‐skinned foreland buttresses. Apatite fission‐track data indicate ~40‐ to 15‐Ma reheating sediment burial Shan. In Gissar...

Abstract At the northwestern tip of India‐Asia collision zone, Pamir orocline overrides Tajik Depression and Tarim Basin collides with Tian Shan. Currently, Pamir's northern edge exhibits localized shortening rates 13–19 mm/yr. While eastern move northward nearly en block, north‐south decreases westward along front into Depression. In northeastern Depression, wedge‐shaped crustal sliver Peter First Range is squeezed between dextral‐transpressive Vakhsh sinistral‐transpressive Darvaz faults....

Abstract Firn densification profiles are an important parameter for ice‐sheet mass balance and palaeoclimate studies. One conventional method of investigating firn is using seismic refraction surveys, but these difficult to upscale large‐area measurements. Distributed acoustic sensing (DAS) presents opportunity large‐scale measurements with dense spatial sampling easy deployment, especially when noise used. We study the feasibility interferometry (SI) on DAS data characterizing layer at...

Abstract The Pamir plateau protrudes ∼300 km between the Tajik‐ and Tarim‐basin lithosphere of Central Asia. Whether its salient location shape are caused by forceful indentation a promontory Indian mantle is debated. We present new local‐seismicity focal‐mechanism catalog, P‐ wave velocity model eastern part collision system. data suggest south‐dipping Asian slab that overturns in easternmost segment. largest principal stress at depth acts normal on orientated parallel to plate convergence...

Abstract Surface, seismic, and borehole data characterize the Neogene‐Recent Tajik fold‐and‐thrust belt of basin. The basin experienced little sub‐detachment basement deformation, acting as a rigid foreland plate during Pamir orogeny. contains variable thin‐skinned structural styles, changing along across strike function thickness facies Upper Jurassic evaporites, which constitute basal detachment, influence surrounding thick‐skinned belts. southern shows regularly spaced, salt‐cored,...

Abstract The crystal orientation fabric of glacier ice impacts its strength and flow. Crystal is therefore an important consideration when modeling Here, we show that shear‐wave splitting (SWS) measured with glacial microseismicity can be used to invert seismic anisotropy fabric, if represented in a statistical sense. Rutford Ice Stream (RIS) fast‐flowing Antarctic stream, setting crucial for informing large‐scale sheet models. We present >200,000 SWS measurements from microseismicity,...

Abstract We use local and teleseismic earthquakes to analyze shear wave splitting within the Pamir‐Hindu Kush region, north of western syntaxis India‐Asia collision zone. These two data sets allowed us map distribution azimuthal anisotropy, put constraints on depth range where it is accumulated, deduce characteristics ongoing deformation. From 1,073 SKS (core‐mantle refracted phases) measurements at 107 stations, we derived time delays 0.7–2.25 s dominantly ENE‐WSW oriented fast polarization...

Abstract. Antarctic ice sheet history is imprinted in the structure and fabric of column. At rises, signature flow preserved due to low strain rates inherent at these independent centres. We present results from a distributed acoustic sensing (DAS) experiment Skytrain Ice Rise Weddell Sea sector West Antarctica, aimed delineating englacial improve our understanding region. This pilot demonstrates feasibility an innovative technique delineate rise structure. Both direct reflected P- S-wave...

We present a local earthquake tomography to illuminate the crustal and uppermost mantle structure beneath southern Puna plateau test delamination hypothesis. Vp Vp/Vs ratios were obtained using travel time variations recorded by 75 temporary seismic stations between 2007 2009. In upper crust, prominent low anomalies are found main volcanic centers, indicating presence of magma melt plateau. lowlands southeast plateau, below Sierras Pampeanas, high body is observed in crust. Beneath Moho at...