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#seismic

1 Beitrag1 Beteiligte*r0 Beiträge heute
Öffentlich *
Robot Diver

I've been watching a lot of walks these days, and I've noticed many rock walls in Kobe are built with the rocks placed on their points/diagonally and I'm wondering if it's strictly a local aesthetic or if there is a benefit in seismic activity for building them like that. It seems that they would flex more like woven fabric that way, but also maybe lock in tighter than flat laid stone, but I don't know enough about structural engineering when it comes to seismic. Anyone have any insight?

#landscape#structuralEngineering#seismic
Öffentlich
💧🌏 Greg Cocks

Seismometers Reveal Earth's Longest-Runout Undersea Sediment Flows In Unprecedented Detail
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phys.org/news/2025-02-seismome <-- shared technical article
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doi.org/10.1038/s43247-025-021 <-- shared paper
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doi.org/10.1016/j.geomorph.202 <-- shared paper
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doi.org/10.1038/s41561-022-010 <-- shared paper
--
#GIS #spatial #mapping #remotesensing #Congo #CongoChannel #bathymetry #seismometers #monitoring #sediment #flow #submarine #massmovement #canyon #infrastructure #pipes #cables #engineeringgeology #geology #model #current #debrisflow #bathymetric #Africa #offshore #coast #coastal #river #WestAfrica #instrumentation #acoustic #doppler #moorings #turbidity #thalweg #morphology #landslides #stratigraphy #seismic #turbiditycurrent #flow #gradient #slope #erosion #risk #hazard #spatialanalysis #spatiotemporal #seabed

cross section / schematic - Surge dynamics of canyon-flushing turbidity currents
Difference maps showing seabed changes (in metres) in the upper Congo Canyon between 2019 and 2020... The grey shaded base map shows seabed gradients in 2020. Shades of red correspond to areas of erosion, and blue to areas of deposition.
Bathymetric map of the Congo Canyon-Channel system and instrument placement
schematics - Schematic summary of the categories for types of seabed erosion observed in the Congo Canyon-channel between 2019 and 2020, and their relative volumetric importance
Öffentlich
💧🌏 Greg Cocks

Large Magma Bodies Found Beneath Dormant Volcanoes, Surprising Scientists
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phys.org/news/2025-01-large-ma <-- shared technical article
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doi.org/10.1038/s41561-024-016 <-- shared paper
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#GIS #spatial #mapping #remotesensing #seismology #seismic #teleseismic #magma #volcano #vulcanism #geophysics #geophysical #geology #structuralgeology #crust #hotspot #PNW #PacificNorthwest #MountRainer #MountSaintHelens #eruption #dormant #Cascades #CascadeRange #spatialanalysis #spatiotemporal #MountHood #ThreeSisters #Oregon #Washington #California #NewberryVolcano #CraterLake #MountShasta #LassenPeak #partialmelt #model #modeling #seismicity #earthquake #risk #hazard #active #threat #monitoring #engineeringgeology #EarlyWarningSystem

photo - An ash plume billows from the crater atop Mount St. Helens hours after its eruption began on May 18th, 1980, in Washington State. The column of ash and gas reached 15 miles into the atmosphere, depositing ash across a dozen states
photo - Mount Rainier, a snowcapped volcano, looms over Puyallup Valley near Orting, Washington. The prospect of a lahar — a swiftly moving debris flow caused by melting snow and ice typically during a volcanic eruption — poses a threat to surrounding communities.
maps/charts - Back-projected P–S conversions with phase polarities and geographical location determination of the Vs reduction bodies
cross sections - Possibilities of partial melts beneath each volcano
Öffentlich
berndandeweg

After a month of increased #seismic activity in #Ethiopia, rumours of a #volcanic #eruption spread. From videos (eg links below) it is clear that heat is close to the surface, leading to boiling mud and steam appearing and a #mud #volcano, comparable to eg. Icelandic sites. No real #volcano with erupting #lava. Yet?
youtube.com/watch?v=KY2pfo5LqD youtube.com/watch?v=GZxp-wZ1IF

YouTubeThousands evacuated in Ethiopia due to volcanic activityVon Associated Press
Öffentlich *
💧🌏 Greg Cocks

Here’s How Earthquakes Are Measured
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nytimes.com/2024/12/05/us/eart <-- shared media article
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usgs.gov/programs/earthquake-h <-- shared technical article
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[I have experienced a number of earthquakes, including the 2001 Nisqually earthquake when I lived in Western Washington State.]
#GIS #spatial #mapping #earthquakes #seismology #magnitude #momentmagnitude #energy #geology #engineeringgeology #risk #hazard #scale #fault #faulting #Richter #logarithmic #rupture #engineering #buildingstandards #seismic #seismometers #shaking #quake #spatialanalysis #spatiotemporal #infrastructure

Jan. 17, 1994 file photo shows a portion of the Bullock's department store in Los Angeles' Northridge Fashion Center that collapsed in the Northridge earthquake. Twenty-five years ago this week, a violent, pre-dawn earthquake shook Los Angeles from its sleep, and sunrise revealed widespread devastation, with dozens killed and $25 billion in damage.
schematic / chart - Earthquake magnitudes and energy release, and comparison with other natural and man-made events.
Maps showing the shaking intensity from two different earthquakes with about the same magnitude.
schematic / chart / map - Visualizing the Power and Frequency of Earthquakes - https://www.visualcapitalist.com/visualizing-the-power-and-frequency-of-earthquakes/
Öffentlich *
💧🌏 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
--
[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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