@misc{DahmHeimannFunkeetal.2018,
  author    = {Dahm, Torsten and Heimann, Sebastian and Funke, Sigward and Wendt, Siegfried and Rappsilber, Ivo and Bindi, Dino and Plenefisch, Thomas and Cotton, Fabrice},
  title     = {Correction to: Seismicity in the block mountains between Halle and Leipzig, Central Germany: centroid moment tensors, ground motion simulation, and felt intensities of two M approximate to 3 earthquakes in 2015 and 2017 (vol 22, pg 985, 2018)},
  series = {Journal of seismology},
  volume    = {22},
  journal   = {Journal of seismology},
  number    = {6},
  publisher = {Springer},
  address   = {Dordrecht},
  issn      = {1383-4649},
  doi       = {10.1007/s10950-018-9773-6},
  pages     = {1669 -- 1671},
  year      = {2018},
  language  = {en}
}
@article{CescaHeimannKriegerowskietal.2017,
  author    = {Cesca, Simone and Heimann, Sebastian and Kriegerowski, Marius and Saul, Joachim and Dahm, Torsten},
  title     = {Moment tensor inversion for nuclear explosions},
  series = {Seismological research letters},
  volume    = {88},
  journal   = {Seismological research letters},
  number    = {2A},
  publisher = {Seismological Society of America},
  address   = {Albany},
  issn      = {0895-0695},
  doi       = {10.1785/0220160139},
  pages     = {300 -- 310},
  year      = {2017},
  abstract  = {Two nuclear explosions were carried out by the Democratic People's Republic of North Korea in January and September 2016. Epicenters were located close to those of the 2006, 2009, and 2013 previous explosions. We perform a seismological analysis of the 2016 events combining the analysis of full waveforms at regional distances and seismic array beams at teleseismic distances. We estimate the most relevant source parameters, such as source depth, moment release, and full moment tensor (MT). The best MT solution can be decomposed into an isotropic source, directly related with the explosion and an additional deviatoric term, likely due to near-source interactions with topographic and/or underground facilities features. We additionally perform an accurate resolution test to assess source parameters uncertainties and trade-offs. This analysis sheds light on source parameters inconsistencies among studies on previous shallow explosive sources. The resolution of the true MT is hindered by strong source parameters trade-offs, so that a broad range of well-fitting MT solutions can be found, spanning from a dominant positive isotropic term to a dominant negative vertical compensated linear vector dipole. The true mechanism can be discriminated by additionally modeling first-motion polarities at seismic arrays at teleseismic distances. A comparative assessment of the 2016 explosion with earlier nuclear tests documents similar vertical waveforms but a significant increase of amplitude for the 2016 explosions, which proves that the 9 September 2016 was the largest nuclear explosion ever performed in North Korea with a magnitude Mw 4.9 and a shallow depth of less than 2 km, although there are no proofs of a fusion explosion. Modeling transversal component waveforms suggests variable size and orientation of the double-couple components of the 2009, 2013, and 2016 sources.},
  language  = {en}
}
@article{TilmannZhangMorenoetal.2016,
  author    = {Tilmann, F. and Zhang, Y. and Moreno, M. and Saul, J. and Eckelmann, F. and Palo, M. and Deng, Z. and Babeyko, Andrey and Chen, K. and B{\´a}ez, Juan Carlos and Schurr, B. and Wang, R. and Dahm, Torsten},
  title     = {The 2015 Illapel earthquake, central Chile: A type case for a characteristic earthquake?},
  series = {Geophysical research letters},
  volume    = {43},
  journal   = {Geophysical research letters},
  publisher = {American Geophysical Union},
  address   = {Washington},
  issn      = {0094-8276},
  doi       = {10.1002/2015GL066963},
  pages     = {574 -- 583},
  year      = {2016},
  abstract  = {On 16 September 2015, the M-W = 8.2 Illapel megathrust earthquake ruptured the Central Chilean margin. Combining inversions of displacement measurements and seismic waveforms with high frequency (HF) teleseismic backprojection, we derive a comprehensive description of the rupture, which also predicts deep ocean tsunami wave heights. We further determine moment tensors and obtain accurate depth estimates for the aftershock sequence. The earthquake nucleated near the coast but then propagated to the north and updip, attaining a peak slip of 5-6 m. In contrast, HF seismic radiation is mostly emitted downdip of the region of intense slip and arrests earlier than the long period rupture, indicating smooth slip along the shallow plate interface in the final phase. A superficially similar earthquake in 1943 with a similar aftershock zone had a much shorter source time function, which matches the duration of HF seismic radiation in the recent event, indicating that the 1943 event lacked the shallow slip.},
  language  = {en}
}
@article{AlHalbouniHolohanTaherietal.2018,
  author    = {Al-Halbouni, Djamil and Holohan, Eoghan P. and Taheri, Abbas and Sch{\"o}pfer, Martin P. J. and Emam, Sacha and Dahm, Torsten},
  title     = {Geomechanical modelling of sinkhole development using distinct elements},
  series = {Solid earth},
  volume    = {9},
  journal   = {Solid earth},
  number    = {6},
  publisher = {Copernicus},
  address   = {G{\"o}ttingen},
  issn      = {1869-9510},
  doi       = {10.5194/se-9-1341-2018},
  pages     = {1341 -- 1373},
  year      = {2018},
  abstract  = {Mechanical and/or chemical removal of material from the subsurface may generate large subsurface cavities, the destabilisation of which can lead to ground collapse and the formation of sinkholes. Numerical simulation of the interaction of cavity growth, host material deformation and overburden collapse is desirable to better understand the sinkhole hazard but is a challenging task due to the involved high strains and material discontinuities. Here, we present 2-D distinct element method numerical simulations of cavity growth and sinkhole development. Firstly, we simulate cavity formation by quasi-static, stepwise removal of material in a single growing zone of an arbitrary geometry and depth. We benchmark this approach against analytical and boundary element method models of a deep void space in a linear elastic material. Secondly, we explore the effects of properties of different uniform materials on cavity stability and sinkhole development. We perform simulated biaxial tests to calibrate macroscopic geotechnical parameters of three model materials representative of those in which sinkholes develop at the Dead Sea shoreline: mud, alluvium and salt. We show that weak materials do not support large cavities, leading to gradual sagging or suffusion-style subsidence. Strong materials support quasi-stable to stable cavities, the overburdens of which may fail suddenly in a caprock or bedrock collapse style. Thirdly, we examine the consequences of layered arrangements of weak and strong materials. We find that these are more susceptible to sinkhole collapse than uniform materials not only due to a lower integrated strength of the overburden but also due to an inhibition of stabilising stress arching. Finally, we compare our model sinkhole geometries to observations at the Ghor Al-Haditha sinkhole site in Jordan. Sinkhole depth / diameter ratios of 0.15 in mud, 0.37 in alluvium and 0.33 in salt are reproduced successfully in the calibrated model materials. The model results suggest that the observed distribution of sinkhole depth / diameter values in each material type may partly reflect sinkhole growth trends.},
  language  = {en}
}
@article{SchmidPetersenHooftetal.2022,
  author    = {Schmid, Florian and Petersen, Gesa M. and Hooft, Emilie E. E. and Paulatto, Michele and Chrapkiewicz, Kajetan and Hensch, Martin and Dahm, Torsten},
  title     = {Heralds of future volcanism: Swarms of microseismicity beneath the submarine Kolumbo volcano indicate opening of near-vertical fractures exploited by ascending melts},
  series = {Geochemistry, geophysics, geosystems},
  volume    = {23},
  journal   = {Geochemistry, geophysics, geosystems},
  number    = {7},
  publisher = {American Geophysical Union},
  address   = {Washington},
  issn      = {1525-2027},
  doi       = {10.1029/2022GC010420},
  pages     = {21},
  year      = {2022},
  abstract  = {The Kolumbo submarine volcano in the southern Aegean (Greece) is associated with repeated seismic unrest since at least two decades and the causes of this unrest are poorly understood. We present a ten-month long microseismicity data set for the period 2006-2007. The majority of earthquakes cluster in a cone-shaped portion of the crust below Kolumbo. The tip of this cone coincides with a low Vp-anomaly at 2-4 km depth, which is interpreted as a crustal melt reservoir. Our data set includes several earthquake swarms, of which we analyze the four with the highest events numbers in detail. Together the swarms form a zone of fracturing elongated in the SW-NE direction, parallel to major regional faults. All four swarms show a general upward migration of hypocenters and the cracking front propagates unusually fast, compared to swarms in other volcanic areas. We conclude that the swarm seismicity is most likely triggered by a combination of pore-pressure perturbations and the re-distribution of elastic stresses. Fluid pressure perturbations are induced likely by obstructions in the melt conduits in a rheologically strong layer between 6 and 9 km depth. We conclude that the zone of fractures below Kolumbo is exploited by melts ascending from the mantle and filling the crustal melt reservoir. Together with the recurring seismic unrest, our study suggests that a future eruption is probable and monitoring of the Kolumbo volcanic system is highly advisable.},
  language  = {en}
}
@misc{CescaStichGrigolietal.2022,
  author    = {Cesca, Simone and Stich, Daniel and Grigoli, Francesco and Vuan, Alessandro and L{\´o}pez-Comino, Jos{\´e} {\´A}ngel and Niemz, Peter and Blanch, Estefan{\´i}a and Dahm, Torsten and Ellsworth, William L.},
  title     = {Reply to: Multiple induced seismicity mechanisms at Castor underground gas storage illustrate the need for thorough monitoring},
  series = {Nature communications},
  volume    = {13},
  journal   = {Nature communications},
  number    = {1},
  publisher = {Nature Research},
  address   = {Berlin},
  issn      = {2041-1723},
  doi       = {10.1038/s41467-022-30904-5},
  pages     = {4},
  year      = {2022},
  language  = {en}
}
@article{CescaSuganRudzinskietal.2022,
  author    = {Cesca, Simone and Sugan, Monica and Rudzinski, Lukasz and Vajedian, Sanaz and Niemz, Peter and Plank, Simon and Petersen, Gesa and Deng, Zhiguo and Rivalta, Eleonora and Vuan, Alessandro and Linares, Milton Percy Plasencia and Heimann, Sebastian and Dahm, Torsten},
  title     = {Massive earthquake swarm driven by magmatic intrusion at the Bransfield Strait, Antarctica},
  series = {Communications earth and environment},
  volume    = {3},
  journal   = {Communications earth and environment},
  number    = {1},
  publisher = {Springer Nature},
  address   = {London},
  issn      = {2662-4435},
  doi       = {10.1038/s43247-022-00418-5},
  pages     = {11},
  year      = {2022},
  abstract  = {An earthquake swarm affected the Bransfield Strait, Antarctica, a unique rift basin in transition from intra-arc rifting to ocean spreading. The swarm, counting similar to 85,000 volcano-tectonic earthquakes since August 2020, is located close to the Orca submarine volcano, previously considered inactive. Simultaneously, geodetic data reported up to similar to 11 cm north-westward displacement over King George Island. We use a broad variety of geophysical data and methods to reveal the complex migration of seismicity, accompanying the intrusion of 0.26-0.56 km(3) of magma. Strike-slip earthquakes mark the intrusion at depth, while shallower normal faulting the similar to 20 km long lateral growth of a dike. Seismicity abruptly decreased after a Mw 6.0 earthquake, suggesting the magmatic dike lost pressure with the slipping of a large fault. A seafloor eruption is likely, but not confirmed by sea surface temperature anomalies. The unrest documents episodic magmatic intrusion in the Bransfield Strait, providing unique insights into active continental rifting.},
  language  = {en}
}
@article{FlovenzWangHersiretal.2022,
  author    = {Fl{\´o}venz, {\´O}lafur G. and Wang, Rongjiang and Hersir, Gylfi P{\´a}ll and Dahm, Torsten and Hainzl, Sebastian and Vassileva, Magdalena and Drouin, Vincent and Heimann, Sebastian and Isken, Marius Paul and Gudnason, Egill {\´A}. and {\´A}g{\´u}stsson, Kristj{\´a}n and {\´A}g{\´u}stsd{\´o}ttir, Thorbj{\"o}rg and Hor{\´a}lek, Josef and Motagh, Mahdi and Walter, Thomas R. and Rivalta, Eleonora and Jousset, Philippe and Krawczyk, Charlotte M. and Milkereit, Claus},
  title     = {Cyclical geothermal unrest as a precursor to Iceland's 2021 Fagradalsfjall eruption},
  series = {Nature geoscience},
  volume    = {15},
  journal   = {Nature geoscience},
  number    = {5},
  publisher = {Nature Research},
  address   = {Berlin},
  issn      = {1752-0894},
  doi       = {10.1038/s41561-022-00930-5},
  pages     = {397 -- 404},
  year      = {2022},
  abstract  = {Understanding and constraining the source of geodetic deformation in volcanic areas is an important component of hazard assessment. Here, we analyse deformation and seismicity for one year before the March 2021 Fagradalsfjall eruption in Iceland. We generate a high-resolution catalogue of 39,500 earthquakes using optical cable recordings and develop a poroelastic model to describe three pre-eruptional uplift and subsidence cycles at the Svartsengi geothermal field, 8 km west of the eruption site. We find the observed deformation is best explained by cyclic intrusions into a permeable aquifer by a fluid injected at 4 km depth below the geothermal field, with a total volume of 0.11 ± 0.05 km3 and a density of 850 ± 350 kg m-3. We therefore suggest that ingression of magmatic CO2 can explain the geodetic, gravity and seismic data, although some contribution of magma cannot be excluded.},
  language  = {en}
}