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#fault

2 posts2 participants0 posts today
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WIST Quotations

A quotation from Joubert

Perhaps we need, for worldly success, virtues which make us loved and vices which make us feared.
 
[Peut-être, pour les succès du monde, faut-il des vertus qui fassent aimer, et des défauts qui fassent craindre.]

Joseph Joubert (1754-1824) French moralist, philosopher, essayist, poet
Pensées [Thoughts], ch. 9 “De la Sagesse, de la Vertu, etc. [On Wisdom and Virtue],” ¶ 26 (1850 ed.) [tr. Collins (1928), ch. 8]

Sourcing, notes, alternate translations: wist.info/joubert-joseph/28523…

#quote#quotes#quotation
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berndandeweg

#earthquake #Tibet: a very strong earthquake for a normal faulting (extension) mechanism along a NS trending #fault. Extension in high mountainous areas seems contradictive, but is due to potential energy: when a bulldozer pushes a pile of sand, the top will collapse. #aardbeving
masto.ai/@lastquake/1137845255

MastodonLastQuake (@lastquake@masto.ai)Attached: 1 image 🔎 What was the faulting motion that caused the #earthquake (#भूकम्प) in Nāmche Bāzār? Moment tensor map from seismological institute(s):
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💧🌏 Greg Cocks

Research Offers Insights Into Permian Basin Earthquake Hazards
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phys.org/news/2024-12-insights <-- shared technical article
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doi.org/10.1306/intro100124241 <-- shared paper(s)
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usgs.gov/programs/earthquake-h <-- USGS earthquake record, including catalogue
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#GIS #spatial #mapping #model #modeling #3dmodeling #Texas #NewMexico #well #fracking #injection #oilandgas #petroleumindustry #wastewater #PermianBasin #subsurface #reservoirs #fault #faulting #earthquake #sesimicity #inducedseismicity #geology #basin #spatialanalysis #spatiotemporal #risk #hazard #reservoirengineering #geomechanics #WestTexas #oil #gas #production #Midland #MidlandBasin #regulations

photo - workers at a fracking rig in Midland, TX
graphic - The cover of the special issue of AAPG Bulletin containing the seven Permian Basin studies led by researchers at the Bureau of Economic Geology at The University of Texas at Austin. The diagram illustrates the geologic complexity of Paleozoic strata used for wastewater disposal and the relationship to underlying seismogenic basement in the central Midland Basin of west Texas.
geologic cross-section - West-to-east profile of the Permian Basin with all relevant operational information projected in from the north and south in depth from surface.
map - Generalized map of the Permian Basin showing earthquakes as merged with duplicates removed from the US Geological Survey for the period 2000–2023, Gan and Frohlich (2013) for 2009–2010, the Texas Seismological Network Earthquake Catalog for 2017–2023, and the New Mexico Tech Seismological Observatory for southeast New Mexico for 2019–2023.
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💧🌏 Greg Cocks

The 2023 US 50-State National Seismic Hazard Model - Overview And Implications
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usgs.gov/programs/earthquake-h <-- USGS technical article
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doi.org/10.1177/87552930231215 <-- shared paper
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#GIS #spatial #mapping #earthquake #seismichazard #risk #hazard #shakemap #cost #economics #geology #engineeringgeology #hazardmodel #model #modeling #seismicity #faultruptures #groundmotions #probabilistic #probability #geostatistics #engineering #planning #management #mitigation #NSHM #forecast #infrastructure #publicsafety #hazardassessment #fault #faulting #structuralgeology #intensity #mercalli #buildingcode #design #publicpolicy #shakemap #engineeringrisk #future
@USGS @FEMA

A map from the 2018 United States Seismic Hazard Model showing highest hazard in red and lowest hazard in gray. Damage from various earthquakes around the U.S. is shown in the photographs. Larger versions of each photo can be found at: 2001 M6.8 Nisqually, Washington, 2014 M6.0 South Napa, California, 1994 M6.7 Northridge, California, 1975 M7.7 Kalapani, Hawaii, 2011 M5.8 Mineral, Virginia, and 2018 M7.1 Anchorage, Alaska.
maps - The 2023 Modified Mercalli Intensity (MMI) hazard maps of the conterminous United States showing estimates of earthquake shaking in terms of (1) 50% probability of exceedance (PE) in 50 years (somewhat likely), (b) 10% PE in 50 years (uncommon), and (c) 2% PE in 50 years (rare).
maps - Maps show faults, zones applied in the CEUS, and zones of ground-motion model (GMM) amplification for the 2023 50-State National Seismic Hazard Model. The inset map is a close-up view of the New Madrid seismic zone area (orange dashed boundary). Spatial boundaries include potentially induced earthquakes for the update and the previous 2018 zones, 2023 central and eastern United States (CEUS)–western United States (WUS) attenuation boundary update and 2018 boundary, WUS basins, and two areas of uniform seismicity. Fault sections for the WUS (Hatem et al., 2022a, 2022b) and for Alaska from Bender et al. (2021) are shown colored according to slip rates. Fault sections in the CEUS are not shown according to slip rates but all slip rates are less than 0.2 mm/year. The Alaska megathrust is represented by 14 segmented zones. Damaging earthquake locations are shown in all three maps. In addition, we show seismicity for Alaska (M7+) and Hawaii (M5+) (Petersen et al., 2021; Rukstales et al., 2021)....
maps and charts - Normalized probability density function grids of seismicity-based earthquake rates (no fault models) are displayed for (a) the western United States (WUS), (b) the central and eastern United States (CEUS), (c) Alaska, and (d) Hawaii...
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💧🌏 Greg Cocks

Preliminary Observations of the 5 April 2024 Mw 4.8 New Jersey Earthquake
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doi.org/10.1785/0320240024 <-- shared paper
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doi.org/10.1785/0320240020 <-- shared paper
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doi.org/10.1177/87552930231215 <-- shared paper
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[This is ‘unusual’ seismic activity and shaking patterns for this part of the USA, on an ‘unmapped’ fault, and seemingly challenging existing models of earthquake risk in the region; while a 4.8 is not big, it must have been quite a surprise for the people in this heavily populated U.S. Northeast not used to such things (per the paper, the USGS estimated it was felt by some 42 million people.]
#GIS #spatial #mapping #earthquake #risk #hazard #spatialanalysis #model #modeling #NewJersey #USA #geology #engineeringgeology #seismic #USGS #seismology #fault #faulting #Tewksbury #DidYouFeelIt #geotechnical #NIST #remotesensing #InSAR #strikeslip #mechanism #thrust

Map showing the chance of any level of damaging earthquake shaking in 100 years from the 2023 50-State National Seismic Hazard Model.
Photos of Taylor’s Mill taken before and after the 5 April 2024, earthquake.
(a) Topographic map showing a mainshock (yellow star) and seismicity (open circles) across geological units from west‐northwest to east‐southeast: Catskills, Highland, Newark basin, and Atlantic Coastal plain. Ramapo fault trending northeast runs through the epicentral area toward Peekskill, New York (NY) (red lines). Border faults between the geologic units–Highland and Newark basin continue southwest from the epicenter through Pennsylvania (PA). Three large known historical earthquakes, 30 November 1783 M 5.3 New Jersey, 1 September 1895 M 4.1 New Jersey, and 10 August 1884 M 5.5 New York, are plotted by red squares. The 2024 Tewksbury earthquake is ∼20 km west of the 1895 earthquake. (b) Contour map showing mainshock peak ground velocity (PGV) measured on transverse‐component records filtered at 0.3–10 Hz. Stations used for the PGV estimation and Lg relative source time function (RSTF) analysis are plotted as open and gray triangles, respectively.
Geologic map of the epicentral area simplified from Owens et al. (1998) and Drake et al. (1996) draped over topography showing mapped faults (black lines), initial aftershock locations from U.S. Geological Survey (USGS) Comprehensive Earthquake Catalog (ComCat; U.S. Geological Survey [USGS], 2017; downloaded 7 April 2024, at 13:59 UTC; purple circles), and mainshock focal mechanism (see Data and Resources). The location of seismic station BRNJ, which was not recording during the mainshock, is shown by the red square. The New Jersey Highlands, composed of Mesoproterozoic to Ordovician igneous and metamorphic rocks, are shown to the northwest of the white line, and the Newark basin, composed of Mesozoic sedimentary and volcanic rocks, lies to the southeast. Background image is a shaded relief derived from the 10 m National Elevation Dataset (see Data and Resources). Seismicity in inset (gray dots and yellow stars) is from the USGS ComCat (USGS, 2017). The blue rectangle in the inset map indicates the region depicted in the larger figure.
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Olly 👾

Voyager 1 Fault forces Switch to S-Band.

Voyager 1 stopped communicating altogether, suggesting that further fault protection trips disabled the powerful X-band transmitter and switched to the lower-powered S-band downlink. The current problem began when controllers sent a command to turn on one of the spacecraft’s heaters.

blogs.nasa.gov/voyager/2024/10

This was potentially mission-ending; the S-band downlink had last been used in 1981 when the probe was still well within the confines of the solar system, and the fear was that the Deep Space Network would not be able to find the weak signal. But find it they did and on October 22 they sent a command to confirm S-band communications. At this point, controllers can still receive engineering data and command the craft, but it remains to be seen what can be done to restore full communications. They haven’t tried to turn the X-band transmitter back on yet, wisely preferring to further evaluate what caused the fault protection error that kicked this whole thing off before committing to a step like that. <Following Voyager news these days feels a little morbid, like a death watch on an aging celebrity.>
#voyager1#fault#sband
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