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Slow slip events in the roots of the San Andreas fault

Baptiste Rousset, Roland Bürgmann, Michel Campillo
2019 Science Advances  
On continental strike-slip faults, tremors have been observed in the roots of the Parkfield segment of the San Andreas fault. However, associated transient aseismic slip has never been detected.  ...  Characterization of transient SSEs below the Parkfield locked asperity, at the transition with the creeping section of the San Andreas fault, provides new constraints on the seismic cycle in this region  ...  Persistent tremor and LFE activity at the deep transition zone have been detected along two segments of continental strike-slip faults in the world: a section of the San Andreas fault (SAF) near Parkfield  ... 
doi:10.1126/sciadv.aav3274 fatcat:6n4ei4o7jngajezt6xy27tumlu

Spatial variations in slip deficit on the central San Andreas Fault from InSAR

Isabelle Ryder, Roland Bürgmann
2008 Geophysical Journal International  
S U M M A R Y We use ERS InSAR measurements to record spatial variations in creep rate along the creeping segment of the San Andreas Fault (SAF), California, between 1992 and 2001.  ...  Johanson & Bürgmann 2005; Murray & Langbein 2006).  ...  I N T RO D U C T I O N The San Andreas Fault (SAF) system stretches from the Gulf of California 1100 km northwestwards up to the Mendocino triple junction.  ... 
doi:10.1111/j.1365-246x.2008.03938.x fatcat:mpcg3y4qojgaxjhuacebj3xrde

Tremor-tide correlations and near-lithostatic pore pressure on the deep San Andreas fault

Amanda M. Thomas, Robert M. Nadeau, Roland Bürgmann
2009 Nature  
Here we identify a robust correlation between extremely small, tidally induced shear stress parallel to the San Andreas fault and non-volcanic tremor activity near Parkfield, California.  ...  There are a number of similarities between tremor in subduction zone environments, such as Cascadia and Japan, and tremor on the deep San Andreas transform 3-12 , suggesting that the results presented  ...  The peak percentage excess occurs at N 44u W, nearly parallel to the local strike of the San Andreas fault (N 45u W).  ... 
doi:10.1038/nature08654 pmid:20033046 fatcat:csifnjqy5jegdd4kjlji6bj24a

Inferring fault rheology from low-frequency earthquakes on the San Andreas

N. M. Beeler, Amanda Thomas, Roland Bürgmann, David Shelly
2013 Journal of Geophysical Research - Solid Earth  
Families of recurring low-frequency earthquakes (LFEs) within nonvolcanic tremor (NVT) on the San Andreas fault in central California show strong sensitivity to shear stress induced by the daily tidal  ...  Tidal Modulation of Tremor on the San Andreas [14] In contrast to shallow earthquakes which are quite insensitive to the tides except in cases of high-tidal amplitude, NVT and LFEs on the San Andreas near  ...  Unlike in subduction zones, NVT and associated LFEs on the San Andreas are not associated with geodetically detectable episodes of transient rapid fault creep [Smith and Gomberg, 2009] .  ... 
doi:10.1002/2013jb010118 fatcat:f7k4eprvqbde3kunxap47xkaom

Aerobic methane oxidation under copper scarcity in a stratified lake

Carole Guggenheim, Andreas Brand, Helmut Bürgmann, Laura Sigg, Bernhard Wehrli
2019 Scientific Reports  
Aerobic methane-oxidizing bacteria (MOB) substantially reduce methane fluxes from freshwater sediments to the atmosphere. Their metalloenzyme methane monooxygenase (MMO) catalyses the first oxidation step converting methane to methanol. Its most prevalent form is the copper-dependent particulate pMMO, however, some MOB are also able to express the iron-containing, soluble sMMO under conditions of copper scarcity. So far, the link between copper availability in different forms and biological
more » ... ane consumption in freshwater systems is poorly understood. Here, we present high-resolution profiles of MOB abundance and pMMO and sMMO functional genes in relation to copper, methane and oxygen profiles across the oxic-anoxic boundary of a stratified lake. We show that even at low nanomolar copper concentrations, MOB species containing the gene for pMMO expression are present at high abundance. The findings highlight the importance of copper as a micronutrient for MOB species and the potential usage of copper acquisition strategies, even under conditions of abundant iron, and shed light on the spatial distribution of these microorganisms.
doi:10.1038/s41598-019-40642-2 pmid:30886176 pmcid:PMC6423226 fatcat:bqr4bc67mnap7g2cpymru5ds7e

Nicht nur scharfe und spitze Gegenstände sind gefährlich!

Konstantin Burgmann, Andreas Nydegger, Alain Schoepfer
2014 Swiss Medical Forum = Schweizerisches Medizin-Forum  
Konstantin Burgmann a , Andreas Nydegger b , Alain Schoepfer a CHUV Lausanne a Service de Gastro-entérologie et d'Hépatologie, b Unité de Gastro-entérologie et Nutrition Pédiatrique Das Verschlucken von  ...  Konstantin Burgmann Centre Hospitalier Universitaire Vaudois Service de Gastro-entérologie et d'Hépatologie Rue du Bugnon 44 CH-1011 Lausanne konstantin.burgmann[at]chuv.ch Literatur 1  ... 
doi:10.4414/smf.2014.02103 fatcat:uquk5bqm3jbsdo2qnoqlgleqqa

Nicht nur scharfe und spitze Gegenstände sind gefährlich!

Konstantin Burgmann, Andreas Nydegger, Alain Schoepfer
2014 Swiss Medical Forum = Forum Médical Suisse  
Konstantin Burgmann a , Andreas Nydegger b , Alain Schoepfer a CHUV Lausanne a Service de Gastro-entérologie et d'Hépatologie, b Unité de Gastro-entérologie et Nutrition Pédiatrique Das Verschlucken von  ...  Konstantin Burgmann Centre Hospitalier Universitaire Vaudois Service de Gastro-entérologie et d'Hépatologie Rue du Bugnon 44 CH-1011 Lausanne konstantin.burgmann[at]chuv.ch Literatur 1  ... 
doi:10.4414/fms.2014.02103 fatcat:gbfimio64ffmncq6fxswrqnxre

A revised position for the primary strand of the Pleistocene-Holocene San Andreas fault in southern California

Kimberly Blisniuk, Katherine Scharer, Warren D Sharp, Roland Burgmann, Colin Amos, Michael Rymer
2021 Science Advances  
The San Andreas fault has the highest calculated time-dependent probability for large-magnitude earthquakes in southern California.  ...  Reconstruction of offset Pleistocene-Holocene landforms dated using the uranium-thorium soil carbonate and beryllium-10 surface exposure techniques indicates slip rates of 24.1 ± 3 millimeter per year for the San Andreas  ...  The faults of the southern San Andreas fault system, inclusive of the San Andreas fault (SAF), San Jacinto fault, and Elsinore fault (Fig. 1A) , all accommodate Pacific-North American (PA-NA) plate motion  ... 
doi:10.1126/sciadv.aaz5691 pmid:33762350 pmcid:PMC7990351 fatcat:dy3ipshfxrerbfncce4ktmwvdq

Using Low-Frequency Earthquake Families on the San Andreas Fault as Deep Creepmeters

A. M. Thomas, N. M. Beeler, Q. Bletery, R. Burgmann, D. R. Shelly
2018 Journal of Geophysical Research - Solid Earth  
The central section of the San Andreas Fault hosts tectonic tremor and lowfrequency earthquakes (LFEs) similar to subduction zone environments.  ...  The central section of the San Andreas Fault hosts tectonic tremor and lowfrequency earthquakes (LFEs) similar to subduction zone environments.  ...  Assuming V L or a long-term deep slip rate of 34 mm/yr (Ryder & Bürgmann, 2008) , this result implies a slip rate of 10 −7 to 10 −6 m/s during slip episodes for the continuous families.  ... 
doi:10.1002/2017jb014404 fatcat:fy6yic7vjrfglpuixini5cwqpu

Potential and limits of InSAR to characterize interseismic deformation independently of GPS data: Application to the southern San Andreas Fault system

E. Chaussard, C. W. Johnson, H. Fattahi, R. Bürgmann
2016 Geochemistry Geophysics Geosystems  
Here we present an analysis using 7 years of Envisat InSAR data to characterize interseismic deformation along the southern San Andreas Fault (SAF) and the San Jacinto Fault (SJF) in southern California  ...  on an empirical phase delay model based on the elevation of the terrain to correct the stratified tropospheric delay [e.g., Remy et al., 2003; Biggs et al., 2007; Cavali e et al., 2008; Shirzaei and Burgmann  ...  Even in southern California, south of the Mojave Desert (Figure 1) , where there is a dense GPS network, slip partitioning between the major faults of the San Andreas Fault (SAF) system remain a subject  ... 
doi:10.1002/2015gc006246 fatcat:6o3mkek5rfdr3lnh2p5cpcik5m

Influence of lithosphere viscosity structure on estimates of fault slip rate in the Mojave region of the San Andreas fault system

Kaj M. Johnson, George E. Hilley, Roland Bürgmann
2007 Journal of Geophysical Research  
Bürgmann (2007), Influence of lithosphere viscosity structure on estimates of fault slip rate in the Mojave region of the San Andreas fault system,  ...  We infer a 20-30 mm/yr slip rate on the San Andreas fault, in agreement with the lower end of geologic estimates.  ...  We obtain slip rates of 20-30 mm/yr for the San Andreas fault.  ... 
doi:10.1029/2006jb004842 fatcat:cwi7nx7knjhxvfujafwxiscjyy

Constraints on Friction, Dilatancy, Diffusivity, and Effective Stress From Low-Frequency Earthquake Rates on the Deep San Andreas Fault

N. M. Beeler, Amanda Thomas, Roland Bürgmann, David Shelly
2018 Journal of Geophysical Research - Solid Earth  
Families of recurring low-frequency earthquakes (LFEs) within nonvolcanic tremor on the San Andreas Fault in central California are sensitive to tidal stresses.  ...  Acknowledgments The central San Andreas LFE catalog (Shelly & Hardebeck, 2010; Shelly, 2017 ) was used in this paper.  ...  Such experiments are needed at conditions appropriate for the deep San Andreas in central California and for the transition zone in Cascadia and other subduction environments.  ... 
doi:10.1002/2017jb015052 fatcat:q7ojwuhig5df7hqpmd776hbj4y

Every fifth published metagenome is not available to science

Ester M Eckert, Andrea Di Cesare, Diego Fontaneto, Thomas U Berendonk, Helmut Bürgmann, Eddie Cytryn, Despo Fatta-Kassinos, Andrea Franzetti, D G Joakim Larsson, Célia M Manaia, Amy Pruden, Andrew C Singer (+2 others)
2020 PLoS Biology  
Have you ever sought to use metagenomic DNA sequences reported in scientific publications? Were you successful? Here, we reveal that metagenomes from no fewer than 20% of the papers found in our literature search, published between 2016 and 2019, were not deposited in a repository or were simply inaccessible. The proportion of inaccessible data within the literature has been increasing year-on-year. Noncompliance with Open Data is best predicted by the scientific discipline of the journal. The
more » ... umber of citations, journal type (e.g., Open Access or subscription journals), and publisher are not good predictors of data accessibility. However, many publications in high-impact factor journals do display a higher likelihood of accessible metagenomic data sets. Twenty-first century science demands compliance with the ethical standard of data sharing of metagenomes and DNA sequence data more broadly. Data accessibility must become one of the routine and mandatory components of manuscript submissions-a requirement that should be applicable across the increasing number of disciplines using metagenomics. Compliance must be ensured and reinforced by funders, publishers, editors, reviewers, and, ultimately, the authors.
doi:10.1371/journal.pbio.3000698 pmid:32243442 pmcid:PMC7159239 fatcat:hts5zdr3lnfhfcerjjar7j56pa

Growth and rapid succession of methanotrophs effectively limit methane release during lake overturn

Magdalena J. Mayr, Matthias Zimmermann, Jason Dey, Andreas Brand, Bernhard Wehrli, Helmut Bürgmann
2020 Communications Biology  
Lakes and reservoirs contribute substantially to atmospheric concentrations of the potent greenhouse gas methane. Lake sediments produce large amounts of methane, which accumulate in the oxygen-depleted bottom waters of stratified lakes. Climate change and eutrophication may increase the number of lakes with methane storage in the future. Whether stored methane escapes to the atmosphere during annual lake overturn is a matter of controversy and depends critically on the response of the
more » ... oph assemblage. Here we show, by combining 16S rRNA gene and pmoA mRNA amplicon sequencing, qPCR, CARD-FISH and potential methane-oxidation rate measurements, that the methanotroph assemblage in a mixing lake underwent both a substantial bloom and ecological succession. As a result, methane oxidation kept pace with the methane supplied from methane-rich bottom water and most methane was oxidized. This aspect of freshwater methanotroph ecology represents an effective mechanism limiting methane transfer from lakes to the atmosphere.
doi:10.1038/s42003-020-0838-z pmid:32144394 fatcat:ktwryyocxvfqvditzfbf73rsse

Aseismic slip and fault-normal strain along the central creeping section of the San Andreas fault

F. Rolandone, R. Bürgmann, D. C. Agnew, I. A. Johanson, D. C. Templeton, M. A. d'Alessio, S. J. Titus, C. DeMets, B. Tikoff
2008 Geophysical Research Letters  
1] We use GPS data to measure the aseismic slip along the central San Andreas fault (CSAF) and the deformation across adjacent faults.  ...  Uniquely, along 170 km of the central San Andreas fault (CSAF), the strike-slip motion occurs nearly aseismically as fault creep.  ...  a small amount of convergent and transcurrent motion accommodated by active thrust faults and folds in the California Coast Ranges on both sides of the San Andreas.  ... 
doi:10.1029/2008gl034437 fatcat:4e7ubt3uyjfpxjhvrkfts7tjgm
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