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#hazardassessment

1 post1 participant0 posts today
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💧🌏 Greg Cocks

Kinematic Evolution Of A Large Paraglacial Landslide In The Barry Arm Fjord Of Alaska
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doi.org/10.1029/2023JF007119 <-- shared paper
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doi.org/10.5066/P9EUCGJQ <-- shared technical article
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sciencebase.gov/catalogMaps/ma <-- shared web mapping service
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#GIS #spatial #mapping #massmovement #landslide #engineeringgeology #remotesensing #sitespecific #LiDAR #iFSAR #paraglacial #kinematics #mapping #monitoring #spatialanalysis #spatiotemporal #fedscience #risk #hazard #glacier #retreat #climatechange #Alaska #BarryArm #fjord #hazardassessment #tsunami #wave #BarryGlacier #change #sensors #fieldwork #surveillance #melting #permafrost #Whittier #geophysics #geology #Alaska #geomorphometry #deglaciating
@USGS

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Giuseppe Bilotta

I'm going to take advantage of the current #eruption on Mt #Etna to discuss some of the challenges of #modelling #lava flows. Buckle up (or just silence me) because this is going to be a long thread.

First of all, why do we want to model lava flows? The answer most definitely isn't «because we can», since —as I'm going to explain momentarily— we actually cannot. Still having an idea about how lava flows and sets in place is a powerful tool for the assessment (and possibly mitigation) of the associated #hazard and #risk: if we can tell how lava flows, we can tell which areas are going to be reached by the lava, and hopefully also improve the design of tactical and strategic actions that can be taken to minimize the damage.

(Of course, whether or not those actions will then be taken is an entirely different matter, but that's mostly politics, not science.)

1/

#MtEtna#simulation#CFD
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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

The Detection Of A Massive Harmful Algal Bloom In The Arctic Prompts Real-Time Advisories To Western Alaskan Communities
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phys.org/news/2024-07-massive- <-- shared technical article
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doi.org/10.1002/lol2.10421 <-- shared paper
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#GIS #spatial #mapping #sampling #publichealth #ecosystem #habitat #climatechange #harmful #agalbloom #HAB #polar #marine #healthimpacts #toxins #Arctic #water #hydrospatial #sampling #model #modeling #BeringStrait #magnitude #scale #density #toxicity #coast #coastal #remote #communities #FirstNation #risk #hazard #response #monitoring #hazardassessment #communication #realtime #advisories #Alaska #WesternAlaska #maritime #subsistence #harvest #fisheries #tracking #spatiotemporal #spatialanalysis #WHOI #PST #algae #foodchain #foodweb #mortality #impacts #subsidence #eventresponse #waterquality

model / map - the HAB (harmful algal bloom), Bering Strait, off Alaska coast
photo - A dashboard image from the IFCB shows high concentrations of the Alexandrium (dark round cells) found in a Bering Strait water sample.
maps - Regional map and progression of the 2022 Alexandrium catenella bloom based on near-surface cell densities. (A) Map of the region depicting major water bodies, land masses, and the maritime boundary with Russia. Alaskan communities within designated regional boroughs are indicated by colored points; regional hub communities are labeled in bold. Bloom observations are grouped by the outbound and return transit of each survey, where the gray dots are the shipboard data points; (B) 22 July–08 August, (C) 08–14 August, (D) 17–31 August, (E) 31 August–06 September. Graduated color scale indicates A. catenella cell density calculated from annotated IFCB imagery; observations are interpolated using a gridding routine that puts more weight along the isobaths (Davis 1998), since the flow on the Chukchi shelf is largely guided by the bathymetry. Locations of the regional hub communities are labeled, and an asterisk is used in (D) to indicate location of highest cell density measured in the bloom (174,000 cells L−1).
schematic - Timeline and structure of information flow from the shipboard IFCB to the regional coastal response. Steps in this process included: Data Collection (seconds to minutes), HAB Assessment (minutes to hours), Stakeholder Coordination and Advisory Development (24–48 h, see Supplementary Materials for advisory text), and Community Mobilization (days, weeks, continuing).
Public
💧🌏 Greg Cocks

Balanced Boulders On San Andreas Fault Suggest The 'Big One' Won't Be As Destructive As Once Thought
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livescience.com/planet-earth/e <-- shared technical article
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agu.confex.com/agu/fm23/meetin <-- shared abstract
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#GIS #spatial #mapping #spatialanalysis #model #modeling #earthquake #faulting #prediction #reconstruction #dating #risk #hazard #hazardassessment #shaking #seismic #earthquakeengineering #LoveJoyButtes #hazardmodel #earthquakemodel #CA #California #geology #engineeringgeology #SanAndreasFault #SanAndreas #fault #groundmotion #history #holocene #earthquakehazard #Mojave #validation #returnperiod #magnitude #mathematicalmodeling

photo - sampling - precariously balanced rocks (PBRs) at Lovejoy Buttes, Mojave, CA
photo - precariously balanced rocks (PBRs) at Lovejoy Buttes, Mojave, CA
photo - scanning marks - precariously balanced rocks (PBRs) at Lovejoy Buttes, Mojave, CA
photo - scanning marks - precariously balanced rocks (PBRs) at Lovejoy Buttes, Mojave, CA
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