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#cascades

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Public
Stephen Rees :verifiedgreen:

Amtrak Shelves 70 Aging ‘Horizon’ Traincars, Upending Cascades Service Indefinitely

A sudden national suspension of Horizon class rail cars has upended service on Amtrak Cascades, forcing some riders onto replacement bus service. The suspension applies to Amtrak’s entire Horizon fleet, which is affecting numerous routes across the country. Amtrak said in a statement today that inspectors discovered corrosion on several Horizon rail cars

theurbanist.org/2025/03/26/amt

Passengers board Amtrak at King Street Station. Cascades is down to one daily run due to a sudden suspension of Horizon traincars that compose the bulk of its fleet. (Ryan Packer)
#Amtrak#Cascades
Public
💧🌏 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
Public *
💧🌏 Greg Cocks

Atop The Oregon Cascades, [Research] Team Finds A Huge Buried Aquifer
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eurekalert.org/news-releases/1 <-- shared technical article
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doi.org/10.1073/pnas.241515512 <-- shared paper
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usgs.gov/centers/oregon-water- <-- shared USGS technical article, 2011, ‘McKenzie River Source Water Study’
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youtu.be/6R8e5HwGMwU?si=sniW4b <-- shared media video overview
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#GIS #spatial #mapping #model #modeling #water #hydrology #Oregon #Cascades #CascadeMountains #PNW #PacificNorthwest #volcanic #rocks #aquifer #waterresources #watermanagement #climatechange #snowpack #drought #spatialanalysis #CriticalZone #geohazards #geology #engineeringgeology #landscapes #weathering #bedrock #holocene #groundwater #structuralgeology #orogeny #remotesensing #geophysics #sampling #drilling #porosity #permability #tomography #lava #spring #seep #breccia #discharge #streams #runoff #precipitation #climate #rainfall #recharge

photo - Scientists examine a large-volume spring in young volcanic rocks of the McKenzie River watershed on the west side of the Cascade topographic crest that was monitored as part of this study. Credit: Benjamin Nash
map, photo and charts - (A) Electrical resistivity tomography of Olallie North Spring, which emerges along a flow contact of _25 ka Scott Mountain lava flows. Lateral variations correspond to spring discharge points along the lava flow basal breccia such as depicted in (B) (photo: Benjamin Nash). (C) Mean of total yearly range in discharge _Q divided by mean annual flow Qavg versus average upstream age for springs and streams. The horizontal line defines “spring-” versus “runoff-” dominated. (D) SD of yearly average summer discharge (June–September), normalized by Qavg, with CZ state shift labeled.
maps and chart - (A) Distribution of geothermal drill holes. Thin black circles’ radii scale with total logged length, and colors indicate the fraction of length for which dT=dz < 20_C/km (implying downward flux of meteoric water). Red circles are the fraction with inverted gradients (dT=dz < 0_C/km). The purple contour indicates bedrock ages <2 Ma, while stars mark Holocene age phreatomagmatic eruption vents. (B) Two example temperature-depth logs from deep wells in old and young bedrock. (C) Porosity (blue) and resistivity (orange) in the Santiam Pass drill hole SP 77-24. Dashed lines indicate low porosity at high measured resistivity. (D) Chemical weathering tracked by oxidation state of iron in the Santiam Pass drill hole. The green box indicates range of Quaternary High Cascades lavas (SI Appendix), indicating that much of the SP 77-24 hole has been oxidized.
maps and cross section - Oregon Cascades study site. (A) Topography, rivers (from USGS blue lines), stream gauges, lakes, and faults. Olallie North Spring (ONS) and HJ Andrews Experimental Forest (HJA) are labeled. (B) Surface bedrock ages (18), geothermal drill holes, and Quaternary volcanic vents (19). Labeled vents exhibited Holocene phreatomagmatic activity: Sand Mountain volcanic field (SMF), Blue Lake Crater (BLC), Twin Craters (TC). Gray areas are mapped as “Sedimentary deposits and rocks” in ref. 18. (C) Cross-section of swath topography and surface bedrock ages (N-S average of _4 km from Santiam Pass, pink box in panel A), with subsurface structures based on published geologic maps (SI Appendix). The proposed Critical Zone (CZ) state shift and physiographic “Western” and “High” Cascade provinces are labeled. (D) Temperature gradient versus depth in drill holes from panel (C). Near-isothermal or inverted temperature gradients define the “rain curtain.”
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