castle mountain fault, alaska

The Castle Mountain fault cuts under the Parks Highway near the Alaska Railroad overpass in Houston. Here we present results from a high-latitude (61°30′ N) trenching study of the Castle Mountain fault in south-central Alaska. maximum possible magnitude earthquake . Recent geologic studies estimate that this fault is capable of producing earthquakes of magnitude 7.0 – 7.1. This data set is a compilation of fault segments from several publications. The Castle Mountain fault (Fig. The Castle Mountain fault anticline (Haeussler and Saltus, 2011) is located on the north side of the seismogenic and right-lateral Castle Mountain fault near Houston, Alaska, about 30 miles north of Anchorage. The Castle Mountain Fault (CMF) lies less than 50 km from Alaska's most populous city of Anchorage and represents an important seismic hazard to the Anchorage-Matanuska-Susitna Valley region in southcentral Alaska. Date: 4/24/2019 Time: 06:00 PM Room: Fifth Avenue The Castle Mountain fault system (CMFS) lies less than 50 km from Anchorage and represents an important seismic hazard to the Anchorage-Matanuska-Susitna Valley region. Alaska State Parks Mat-Su/Copper Basin Area Office 7278 E. Bogard Road Wasilla, AK 99654 (907)745-3975 www.alaskastateparks.org Area History Hatcher Pass Management Area, located in the southwestern Talkeetna Mountains, owes its rugged, vertical landscape to tectonic collisions occurring along the Castle Mountain Fault. The Castle Mountain fault is one of several major east-northeast-striking faults in southern Alaska, and it has had historical seismicity and Holocene surface faulting. The Castle Mountain fault runs from near Sutton, along the Talkeetna Mountains to the Houston area. The Castle Mountain, one of the most unique-looking massifs in all of Southcentral Alaska, was gradually getting closer this past March as I hiked north on the well-established Permanente Trail, which was once a road built in the 1960s by Kaiser Gypsum, Inc. to access limestone claims. (Detterman and others, 1974). Previous work, including a published seismic-reflection profile, East of Hatcher Pass Road, the Castle Mountain fault has no unequivocal Holocene fault scarp (Detterman and others, 1976), although the only two historical earthquakes on the Castle Mountain fault occurred along this part of the fault (Lahr and others, 1986; and Alaska Earthquake Information Center event 961111). Castle Mountain Fault System This system of northeast striking faults extends roughly 200 km long and is the only fault in the region with Holocene faulting present at the surface. It's located in Alaska, United States.Take a small detour off the Parks Highway near Houston, Alaska, and walk along a section of the Castle Mountain fault. Publication: U.S. Geological Survey Open-File Report 01=504 For the most up-to-date information, please refer to the interactive fault map. This two coverage dataset makes up a 1:25,000 scale surficial geologic map along the Castle Mountain fault between Houston and Hatcher Pass Road in southcentral Alaska. Geophysical Studies of the Subsurface Structure of the Castle Mountain Fault System, Upper Cook Inlet, Alaska. 30 November 2018. It is part of a fault field in Cook Inlet, where earthquakes of 4.6 to 5.7 occurred and where a magnitude 7 or greater can occur. Surficial geologic map of the Castle Mountain fault between Houston and Hatcher Pass Road, Alaska. 322 ConTemPoRARY FAulT meChAniCs in souTheRn AlAskA Figure 1. A magnitude 7.9 earthquake occurred along the . At one locality, gouge contains deformed illite/smectite with very little wall rock chlorite contamination. The Castle Mountain Fault (CMF) is the closest (~50 km) active fault to Anchorage, Alaska. The map area lies entirely within the Anchorage quadrangle and within the Matanuska-Susitna Borough. This publication presents geologic mapping, field notes, and whole-rock major-oxide geochemical analyses of intrusive rocks from an area slightly west of Kings River to considerably east of Boulder Experts say that Matanuska Valley’s Castle Mountain fault is active, and it could slip anytime in the future. Castle Mountain fault, east section (Class B) No. in 1933. The Castle Mountain fault extends along the southern Talkeetna Mountains rangefront and across the Susitna Lowland in south-central Alaska. The Anchorage metropolitan area (which includes the … The character of seismicity varies along the CMF. Most paleoseismic studies are at low to moderate latitudes. Located within the Matanuska and Susitna (Matsu) Valleys, the CMF shows repeated, unmistakable evidence for Holocene motion. How might this data set be cited?Labay, K.A., and Haeussler, P.J., 2001, GIS Coverages of the Castle Mountain Fault, South Central Alaska: U.S. Geological Survey Open-File Report 01-504.Online Links: for each seismic zone based on its physical characteristics. The Castle Mountain Fault (CMF) lies less than 50 km from Alaska's most populous city of Anchorage and represents an important seismic hazard to the Anchorage-Matanuska-Susitna Valley region in southcentral Alaska. The Castle Mountain Fault, which passes 25 miles north of Anchorage, exhibits geological evidence of Holocene offsets and generated the M5.6 1984 Sutton earthquake. Remote, mountainous terrane, and glacial cover, however, preclude On 23 October 2002, the Mw 6.7 Nenana Mountain earthquake occurred in central Alaska. this is the river along the castle mountain fault in alaska on our way to hatcher pass ... september 2012 Castle Mountain fault is active, shows surface expression and is capable of a magnitude 7.5 earthquake at an intermediate depth. Currently, the Alaska Division of Geologic and Geophysical Surveys (ADGGS) The other two active faults are Bruin Bay Fault and Border Ranges Fault. Located within the Matanuska and Susitna (Matsu) Valleys, the CMF shows repeated, unmistakable evidence for Holocene motion. The Castle Mountain fault is a 200-km-long, right-lateral fault that forms the northern boundary of the Cook Inlet basin and Matanuska Valley, Alaska. It is the only fault in the region known to ... ern Alaska on March 27 of that year and the Anchorage area su!ered great damage; intensive geologic and other investigations that … The Castle Mountain Fault (CMF) is the closest (~50 km) active fault to Anchorage, Alaska. Castle Rock may refer to: Castle Rock Alaskan Island an island off the coast of the U.S. state of Alaska Castle Rock Hong Kong 螺洲白排 an island of from the south of Becharof Lake on the Alaskan Peninsula up to its termination point against the Castle - Mountain Lake fault system. In fact, the Denali and San Andreas faults are only two members of a major fault system extending all along the west coast of North America and into the interior of Alaska. Along these faults, offset is occurring as the North Pacific Ocean floor gradually inches its way to the northwest, sliding and grinding against the continent as it does. "The Castle Mountain is often seen as one of the most important active faults in all of Southcentral Alaska," said Peter Haeussler, a research geologist with the U.S. Geological Survey during a recent visit to the fault. by Temblor. It's a Not chosen size geocache, with difficulty of 2, terrain of 2. A surficial geologic map showing the location of the Castle Mountain fault and other active or potentially active faults in the Matanuska-Susitna borough. The Mount Meager massif lies in the Coast Mountains which extend from … Denali Fault. Shaded relief map of central and southern Alaska showing the location of major faults, including the proposed ... Fairweather, and Castle Mountain faults (Table 1). in 2002 while a magnitude 7.0 earthquake occurred along the . The Castle Mountain fault has one fork near Lake Clark (Figure 3). The Castle Mountain fault, oriented N65°E (Fig. This fault is the only one known in the greater Anchorage, Alaska, area with historical seismicity and a Holocene fault scarp. The eastern portion of the fault [where this sign is] produced earthquakes in 1984 and 1996 but does not have a visible scarp. From Houston, Alaska to the west, this movement shifted one side of the fault up, resulting in a visible scarp. The fault is an active structural element of the Aleutian forearc and has formed a 4-km-wide anticline associated with at least 0.5 km of north-side-up displacement. The Castle Mountain fault is one of several major east-northeast-striking faults in southern Alaska, and it is the only fault with historic seismicity and Holocene surface faulting (Lahr and others, 1986; Detterman and others, 1974). 5136c Last Review Date: 2017-02-28 Compiled in cooperation with the Alaska Department of Natural Resources Castle Mountain Fault - Houston, Alaska (GC18FEW) was created by Ladybug Kids on 1/8/2008. For example, the castle mountain fault line spans from Kenai-Cook Inlet to Anchorage. Endpoints labeled "A" indicate the Kobuk fault, those labeled "B" the Tintina, and those labeled "C" the Denali. The fault labeled "D" is principally the Castle Mountain in the eastern part of the image, but loses much of its identity as it curves down to the southwest. The Castle Mountain fault is the only active fault that comes to the earth’s surface in the Anchorage region, and the eastern part of the fault produced light to moderate magnitude 5.7 and 4.6 earthquakes in 1983 and 1996.From the U.S. Geological Survey:USGS Study Shows that Anchorage Area Fault May Be Due for Large Quake Originators: Labay, Keith A. and Haeussler, Peter J. Caribou fault (Castle Mountain fault system), (Class B) No. Fault gouge and fault rock at six localities contain the clay minerals illite, smectite, chlorite, and interstratified illite/smectite. 2), is a significant fault of the region and is considered an ancient right-lateral slice fault similar to two presently active nearby slice faults: the Mount Spurr South fault (MSS) just to the north and the Redoubt fault (RED) just to the south. The Castle Mountain fault is … 5138 Last Review Date: 2012-07-01 Compiled in cooperation with the Alaska Department of Natural Resources Accessed from Mile 71.8 on the Glenn Highway, the Permanente is today a multi-use trail that is 1) lies northwest of Anchorage within the Peninsu-lar terrane. The location of the Lake Clark fault relative to Pebble is unknown. I see many new … The Castle Mountain Fault (CMF) is the closest (~50 km) active fault to Anchorage, Alaska. Its western trace creases the forest and swamp between Big Lake and Willow for miles. The diffuse zone of seismicity between Cook Inlet and the Denali Fault may mark a deformation zone between the Bering microplate to the west and the southern Alaska block to the east. A magnitude 5.7 m b (5.2 M s) earthquake occurred on 14 August 1984, 14 km north of Sutton, in the vicinity of the mapped trace of the Talkeetna segment of the Castle Mountain fault system.The focal mechanism of the earthquake and the spatial distribution of well-controlled aftershock hypocenters indicate that the shock involved dextral slip at 13- to 20-km depth on the Talkeetna fault segment. Recent geologic studies estimate that this fault is capable of producing earthquakes of magnitude 7.0 – 7.1. It was followed on 3 November 2002 by the Mw 7.9 Denali Fault … quakes in Alaska over the past century. This one example of a … The Castle Mountain fault is part of a larger field of folds and faults in the Cook Inlet region that are capable of producing magnitude 6-7 earthquakes, but because geologists consider the Castle Mountain fault one of the largest and most significant in the region, understanding its earthquake history is important. Located within the Matanuska and Susitna (Matsu) Valleys, the CMF shows repeated, unmistakable evidence for Holocene motion. The Castle Mountain fault was delineated on a regional scale by Detterman and others (1974, 1976), who divided it into two physiographic segments. Anchorage is no stranger to quakes, with this event lying close to the epicenter of the 1964 M=9.2 Good Friday … The U.S.Geological Survey’s Dr. Peter … The system separates River. Anchorage Area Fault May Be Due for 6 or 7 Magnitude Quake. A new study by the U.S. Geological Survey (USGS) shows that the Castle Mountain fault in south-central Alaska may be ready to produce a strong magnitude 6 to 7 earthquake. Castle Mountain Fault. Castle Mountain Fault; Status: Complete; Description: Geologic and derivative materials maps of the Castle Mountain fault system, northern halves of Anchorage C-7 and C-8 quadrangles, Alaska; STATEMAP grant no. The Castle Mountain Fault has been active (moving during earthquakes) for over 35 million years. Here we present results from a high-latitude (61°30′ N) trenching study of the Castle Mountain fault in south-central Alaska. For the most up-to-date information, please refer to the interactive fault map. 1434-93-A-1142; Project Date(s): 1993 - 1994; Primary Contact: Combellick, Rodney A. DGGS section: Engineering Geology; Project Participants: Seismic reflection data demonstrate there is a 3-km wide fault-cored anticline (fold) on the north-side of the trace of the Castle Mountain fault. Recent geologic studies estimate that this fault is capable of producing earthquakes of magnitude 7.0 - 7.1. Ross S. Stein, Ph.D., Jason R. Patton, Ph.D., and Volkan Sevilgen, M.Sc., Temblor, Inc. Today, a M=7.0 earthquake struck 31 km (19 mi) beneath, and just north of, Anchorage, Alaska, causing strong shaking, but so far, light reported damage. This fault is the only one known in the greater Anchorage, Alaska, area with historical seismicity and a Holocene fault scarp. The Castle Mountain fault is a major east-northeast striking fault in southern Alaska with historic seismicity and Holocene surface faulting. the Castle Mountain Fault, produced a magnitude 5.7 earthquake near Sutton in 1984 and may have generated a magnitude 6.9 earthquake that shook Anchorage in 1933. Seismologists can reliably calculate the . The Castle Mountain fault extends along the southern Talkeetna Mountains range front in south-central Alaska.

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