Lmst

Earthquake Hazard Uncertainties Improved Using Precariously Balanced Rocks
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https://doi.org/10.1029/2020AV000182 <-- shared paper
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#GIS #spatial #mapping #spatialanalysis #geomorphometry #probabilistic #seismichazard #analysis #PSHA #groundmotion #earthquake #risk #hazard #naturalhazard #quantitative #fault #faulting #geology #engineeringgeology #empirical #balancedrocks #PBR #California #cosmogenic #10Be #dating #model #modeling #hazardmodel #probability #infrastructure #cost #economics

photo - the Golden Rock in Myanmar is a precarious boulder that has acquired religious significance and is now a major tourist attraction

photo - markers are used along with LiDAR and drones to see if the boulders move over time

charts and photos - Fragility and fragility age results for precariously balanced rock DRW1. (a) 3-D model comparison to a field photo of the most slender view of DRW1 with the measured geometric parameters required for toppling calculations, alpha (α) and radius (R), labeled. (b) PGA (x axis) and PGV/PGA (y axis) vector ground-motion probability of toppling matrix fragility results, colored from blue to yellow with increasing probability of toppling. (c) 3-D model and field photo of DRW1 looking from the toppling direction with the cosmogenic 10Be exposure ages given in ky with 1σ errors at the sample locations. (d) Probability density function (PDF) of the cosmogenic 10Be exposure ages and uncertainties of individual samples collected around DRW1 shown by green lines and aggregated probability density function shown by black line. (e) PDF of all samples collected at the site to bound the fragility age of all seven PBRs shown by red lines, and black dashed line of whole site aggregated PDF. The youngest peak (n = 6) in the aggregated PDF (solid black line and 1.65σ gray shaded area) is selected as the best estimate fragility age of the Double Rock PBRs.

maps and photo - Maps of the Double Rock site in Central California. (a) Regional map showing the Double Rock site (black square) in relation to the Hosgri Fault Zone and other active faults in the USGS Quaternary Fault and Fold Database, shown in red, that contribute to the site's seismic hazard. Population centers are shown by black triangles and site of critical infrastructure by black star. (b) Geologic and geomorphic map of the Double Rock study area (modified from Dibblee & Minch, 2006) overlain on LiDAR hillshade image. The three chert outcrops on which the fragile geologic features form are labeled, and the localities investigated in this study are numbered. Field photo inset (looking toward 140°) shows the paleo-sea stacks DRE and DRW extending above the abandoned major alluvial fan complex Qf1 and modern sea stack DRM.

Alluvial Fan Surfaces And An Age-Related Stability For Cultural Resource Preservation: Nevada Test And Training Range, Nellis Air Force Base, Nevada, USA
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https://doi.org/10.1016/j.jasrep.2015.05.002 <-- 2015 shared paper
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[during a presentation recently, I was reminded of this 2015 paper’s content today (on which I was a co-author), back when papers wanted B&W images; I wonder how we might have proceeded now, with AI / Machine Learning…]
#GIS #spatial #mapping #Nevada #USA #military #NellisAFB #NAFB #NTTR #archaeology #spatialanalysis #spatiotemporal #corrleation #basinandrange #geomorphology #sediment #alluvialfans #sheetwash #eolian #erosion #deposition #bioturbation #varnish #desert #desertvarnish #age #dating #corrleation #airforce #indigeneous #sampling #cosmogenic #10Be #insitu #StonewallFlat #fans #water #hydrology #arid #imageanalysis #CulturalResource #Preservation

chart - correlation - alluvial fan average colour (as a grayscale) vs. analytical sampling age (years)

photos - alluvial fan surfaces and sampling locations

photo - scanned cover - 9th International Conference on Military Geoscience

photo - view of Stonewall Flats, Nevada, USA

Die Sonne ist nicht so ruhig, wie sie oft scheint. Baumringe zeigen einen gigantischen Sonnensturm vor 14 300 Jahren. So ein Ereignis würde heute jahrelanges Chaos verursachen.

Die Sonne ist keineswegs so ruhig wie sie oft scheint. Baumringe zeigen einen gigantischen Sonnensturm vor 14 300 Jahren. So ein Ereignis würde heute jahrelanges Chaos verursachen.#Sonnensturm #Koronaler #Massenauswurf #Sonne #Polarlichter #Eiszeit #Miyake #Ereignis #ältereDryas #Kiefern #Fossil #Baumringe #C-14 #14C #Be-10 #10Be #Astronomie
Größter bekannter Sonnensturm traf die Erde am Ende der Eiszeit

#10Be

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