Fuji is. To the east, the Mendocino fault zone forms one limb of the Mendocino triple junction, a structurally complex region where the Juan de Fuca, North American, and Pacific plates meet. A high level of seismicity at the Mendocino triple junction in Northern California reflects the complex active tectonics associated with the junction of the Pacific, North America, and Gorda plates. Earthquakes at Mendocino Triple Junction, California. stress environment of the migrating triple junction. The Mendocino Triple Junction (MTJ) is one of the most seismically active regions of California, and provides a unique opportunity to study active oceanic transform faults close to land. process – the Mendocino triple junction to the northwest and the Rivera triple junction to the southeast. INTRODUCTION The Mendocino Triple Junction (MTJ) lies at the intersection of the Gorda, Pacific, and North American plates, in one of the most seismically active regions in the western United States. Questo è un elenco di articoli relativi a tettonica delle placche e placche tettoniche. An offshore fault trace would be consistent with peak heating of King Range strata north of the Mendocino triple junction. The San Andreas fault runs offshore near the town of Point Arena to Cape Mendocino, where the San Andreas Fault ends at the "Triple Junction.” The Triple Junction is where the American Plate, Pacific Plate and the Gorda Plate meet. The place where they meet is like a T-junction and there’s a little hole that allows magma under the earth to bubble up. This actively deforming region experiences high seismic activity and young geological features. The Triple Junction is where the American Plate, Pacific Plate and the Gorda Plate meet. To investigate seismicity patterns and crustal structure, 6193 earthquakes recorded by the Northern California Seismic Network (NCSN) are relocated using a one-dimensional crustal velocity … The tsunami will travel outwards in two di- rections sending surges to- wards the coast and out- Introduction [2] Over the past 20 years the heat flow pattern observed in the California Coast Ranges south of the Mendocino triple junction (MTJ) has served as a primary constraint on models of the tectonic evolution of the coastal Californian lithosphere. The Mendocino triple junction migrates northward relative to North America through time (McKenzie and Morgan, 1969), The passage of the MTJ causes mantle material to flow into the region vacated by the Gorda plate. [c5, p120-124]. Pin. As it does so, the direction of relative plate movement along the western edge of the continent changed, with the Pacic plate moving northwest relative ELI A SILVER. At the triple junction a boundary will be one of 3 types - a ridge, trench or transform fault - and triple junctions can be described according to the types of plate margin that meet at them. This Northern part of California is the theater of a very interesting geological location called the Triple Junction. Plate motions recorded in tectonostratigraphic terranes of the Franciscan Complex and evolution of the Mendocino Triple Junction, northwestern California (OCoLC)889716017: Material Type: Government publication, National government publication, Internet resource: Document Type: Book, Internet Resource: All Authors / Contributors: It is a geologic triple junction where three tectonic plates come together. The boundaries between these plates are the San Andreas Fault, the Cascadia Subduction Zone, and the Mendocino Transform Fault (MTF) which meet at the Mendocino Triple Junction near Cape Mendocino, CA. These are RRR (e.g. Download GIS tectonic plates and boundaries data. Tweet. In this region, there is a pronounced north to south increase in the surface heat flow by nearly 200% over a distance of 450 … The junction of the Pacific Plate, Gorda Plate, and North American Plate presently near Cape Mendocino forms a classic triple junction (area where three tectonic plates come together) that has migrated north with time. Some sections are simple while others are more complex extending from the Gulf of California through the Salton Sea Trough into the San Gabriel and San Bernardino Mountains, through the Carrizo Plain into Parkfield, on into the South San Francisco Bay, Point Reyes, and ending in the Mendocino Triple Junction. In Mendocino County the San Andreas Fault is located pretty much right at the coastline. The 25 April 1992 magnitude 7.1 Cape Mendocino thrust earthquake demonstrated that the North America—Gorda plate boundary is seismogenic and illustrated hazards that could result from much larger earthquakes forecast for the Cascadia region. MENDOCINO TRIPLE JUNCTION. Offshore from Cape Mendocino is the Mendocino Triple Junction, a geologic feature occurring where three tectonic plates come together (Pacific Plate, North American Plate, and Gorda Plate). The North American, Pacific, and Gorda-Juan De Fuca Plates come together at the Mendocino Triple Junction. Plates are either ridges (R), trenches (T), or transform faults (F). The concentration of earthquakes at Cape Mendocino is known as the Mendocino Triple Junction. This junction is where the Gorda plate (a south section of the Juan de Fuca Plate), the North American plate, and the Pacific plate meet. The three lithospheric plates that dominate the modern tectonics of coastal California meet at the Mendocino triple junction, which is marked by a dense cluster of epicenters just off Cape Mendocino ( Figure 5.5A; see chap. Plate motions recorded in tectonostratigraphic terranes of the Franciscan Complex and evolution of the Mendocino Triple Junction, northwestern California (OCoLC)889716017: Material Type: Government publication, National government publication, Internet resource: Document Type: Book, Internet Resource: All Authors / Contributors: Near Cape Mendocino, the Mendocino Triple Junction is an area of active seismicity where three tectonic plates come together Sunda Plate (310 words) [view diff] exact match in snippet view article find links to … From 19 to about 12 Ma the northern terminus of this boundary (the Mendocino triple junction) migrated northwestward up the coast attached to the Pacific plate, while the southern terminus (Rivera triple junction) was approximately stationary off northern Baja California (the northwestward drift of the Pacific plate being The Mendocino transform fault is a right-lateral transform fault separating the subducting Gorda/Juan de Fuca plate and the Pacific plate. There is a topographic high immediately south of the Mendocino transform fault between 129øW and the Mendocino triple junction [Krause et al., 1964; Silver, 1971]. Geodetic data comprised of triangulation, trilateration, The three plates come together at the Mendocino Triple Junction (MTJ) (Figure 1), a transform- transform-trench triple junction that was initiated at 25-29 Ma by the collision of a Pacific spreading center with the North American continent [Atwater, 1970]. Upper plate faults along the Cascadia subduction margin of North America go through a 3 stage evolution over millions of years as a consequence of the migrating Mendocino Triple Junction (MTJ). (Photo from: thomashenthorne.com) Over the last month, things have been relatively quiet on the earthquake front. At the triple junction each of the three boundaries will be one of 3 types - a ridge (R), trench (T) or transform fault (F) - and triple junctions can be described according to the types of plate margin that meet at them (e.g. and southward to the latitude of Point Arena. A triple junction is the point where the boundaries of three tectonic plates meet. 3 Offshore Monitoring of deformation at the Cape Mendocino triple junc-tion The pattern of present-day plate deformation around the Mendocino triple junction is largely un- ELI A SILVER. The boundary between the Pacific and North American plates is the San Andreas fault, which, traveling north, leads up to the Triple Junction. Topo-Mendocino – The link between topography and lithospheric processes in the wake of the Mendocino triple junction in northern California, USA Kevin P Furlong, Geodynamics Research Group, Geosciences, Penn State University (kevin@geodyn.psu.edu) Rob Govers, Earth Sciences, Utrecht University, The Netherlands motion near and southeast of the Mendocino triple junction . Particles from each plate collision float along the ocean floor until they are deposited. The Mendocino Triple Junction, the site where the North America, Paclific and the Gorda plates meet, migrates northward with time relative to a fixed North American reference frame. Where the three intersect is a seismically active F-F-T triple junction called the Mendocino Triple Junction. The strongest was M4.8 detected at 06:46 UTC on May 5. The Mendocino Fracture Zone is a fracture zone and transform boundary off the coast of Cape Mendocino in far northern California.It runs westward from a triple junction with the San Andreas Fault and the Cascadia subduction zone to the southern end of the Gorda Ridge.It continues on west of its junction with the Gorda Ridge, as an inactive remnant section which extends for several hundred miles. The Mendocino Triple Junction (MTJ) is located on the coast of northernCaliforniaandmarksthe intersectionof theNorthAmerican, Paci"candGorda-JuandeFuca(G-JdF)plates(seeFig.1).Tothenorth is the Cascadia subduction zone where the Juan de Fuca plate, a fragment of the ancient Farallon plate, is subducting beneath North America. At the triple junction each of the three boundaries will be one of 3 types – a ridge (R), trench (T) or transform fault (F) – and triple junctions can be described according to the types of plate margin that meet at them (e.g. The geological and tectonic setting of the strike-slip plate boundary system (San Andreas fault-Maacama fault and Bartlett Springs fault) in northern California Coast Ranges. Triple junction. MENDOCINO TRIPLE JUNCTION . The region is dominated by Mesozoic … The best known geologic feature in northern California is the San Andreas fault (Oakshott, 1972), which extends north along the coast from San Francisco and ends at the "Triple Junction" offshore of Cape Mendocino. 1).To the north is the Cascadia subduction zone where the Juan de Fuca plate, a fragment of the ancient Farallon plate, is subducting beneath North America. The Mendocino Triple Junction, the site where the North America, Paclific and the Gorda plates meet, migrates northward with time relative to a fixed North American reference frame. Mendocino triple junction (Zandt and Furlong, 1982; Furlong et al., 1989; Merritts and Bull, 1989). A triple junction is the intersection of three plate boundaries. Plates are either ridges (R), trenches (T), or transform faults (F). The concentration of earthquakes at Cape Mendocino is known as the Mendocino Triple Junction. Tectonics of the Mendocino Triple Junction. North-south compression across the Gorda-Pacific plate boundary caused by the northward-migrating Mendocino triple junction appears to reactivate Gorda plate normal faults, originally formed at the spreading ridge, as left-lateral strike-slip faults. The Mendocino triple junction area of northern California is underlain by the Coastal belt of the Franciscan complex, flanked on the east by the Central and Eastern belts of the Franciscan Complex. The Mendocino Triple Junction (MTJ) marks the boundary where the Gorda plate, North American Plate, and Pacific Plate meet, separating the Cascadia subduction zone to the North from transform tectonics of the San Andreas plate boundary. the Mendocino triple junction, subduction continues, and as the Juan de Fuca plate disappears, the triple junction moves northwest along the continental margin like a closing zipper. Search for other works by this author on: GSW. 1). The Mendocino triple junction migrated steadily up the coast, attached to the Mendocino fracture zone on the Pacific plate. The Cascade volcanic range originated between 55 and 42Ma and has been an active arc-subduction complex for 36Ma (Swanson, 1989). It was formed ~28 Ma when the Pacific spreading ridge first contacted the western margin of the North American plate. However, at the Mendocino Triple Junction in Northern California, we find evidence for slight changes in GPS interseismic motion within the last decade that challenge the assumption of constant interseismic deformation. The Mendocino Triple Junction (MTJ) is located on the coast of northern California and marks the intersection of the North American, Pacific and Gorda-Juan de Fuca (G-JdF) plates (see Fig. The Mendocino Triple Junction (MTJ) is a transform–transform-trench triple junction forming the intersection of the Pacific, North American and Gorda plates in northern California (e.g., Dickinson and Snyder, 1979, Furlong and Schwartz, 2004) ().The MTJ was formed ~ 25–29 Ma by the impingement of the Pacific–Farallon ridge on the North American trench, initiating San Andreas fault … There are roughly 50 plates on Earth with about 100 triple junctions among them. The San Andreas Fault, a transform boundary, runs south from the junction, separating the Pacific Plate and the North American Plate. The Mendocino triple junction to the northwest is the meeting point of the Pacific, North American, and Juan de Fuca plates. The slip on crustal faults north of the Mendocino triple junction may consume 4-5 mm/yr of Pacific-Humboldt convergence. 1666). A stable triple junction will maintain it configuration over time, and it will almost certainly migrate with respect to the plates. 1. The remaining 17-18 mm/yr of convergence may be consumed as distributed shortening expressed in the high rates of uplift in the Cape Mendocino region or as northward translation of the continental margin, north of the triple junction. The Mendocino triple junction lies at the junction between the Pacifi c, North American, and Juan de Fuca (or Gorda) plates (Fig. the Mendocino triple junction (MTJ), the San Andreas fault system (SAF) is the transform (strike-slip) boundary between the Pacific and North American plates. The Gorda Escarpment is a north facing scarp immediately south of the Mendocino transform fault (the Gorda/Juan de Fuca-Pacific plate boundary) between 126°W and the Mendocino triple junction. Background:. Cenni sulla tettonica delle placche - Outline of plate tectonics. North of Cape Mendocino (CM), the Juan de Fuca and Gorda plates are converging with the North American plate along the Cascadia subduction zone. Posted on May 26, 2015 Updated on May 27, 2015. 1A). A few kilometers offshore of Cape Mendocino, in northern California, is the Mendocino Triple Junction, at which the North American Plate, the Pacific Plate and the Gorda Plate (the southern-most part of the Juan de Fuca Plate, a fragment of the now broken-up Farallon Plate) meet. stress environment of the migrating triple junction. The initial 7.2 quake on April 25, late on a spring Saturday morning, happened at the very southern edge of the Northwest seismic zone, where the Gorda Plate meets the North American Plate and the San Andreas Fault goes out to sea: the Pacific Plate edging up against the two other plates makes it a triple junction known as the Mendocino Fault Zone. Initially, NE-directed cyclic shortening produced by the Cascadia subduction earthquake cycle drives reverse dip-slip motion on trench-parallel faults. The San Andreas Fault Zone covers almost the entire length of western California. North-south compression across the Gorda-Pacific plate boundary caused by the northward-migrating Mendocino triple junction appears to reactivate Gorda plate normal faults, originally formed at the spreading ridge, as left-lateral strike-slip faults. the triple junction through inversion of fault plane solutions, and find compelling evidence that the north-south compres- sion dominant in the Gorda plate extends at least as far east as the onshore location of the triple junction, approximately 25 km southeast of Cape Mendocino (Figure 1). This region has experienced substantial recent large earthquake activity, and quantification of these faulting processes is essential for understanding the evolution of the triple junction. The 25 April 1992 magnitude 7.1 Cape Mendocino thrust earthquake demonstrated that the North America—Gorda plate boundary is seismogenic and illustrated hazards that could result from much larger earthquakes forecast for the Cascadia region. The Mendocino Triple Junction is the meeting place of the North American, Pacific and Gorda tectonic plates, and thus an area of notable seismic activity. At the north end of the San Andreas fault off Cape Mendocino, three lithospheric plates (the Juan de Fuca, Pacific, and North American) meet at the Mendocino triple junction, where a trench meets two transform faults, the San Andreas and Mendocino faults. The Mendocino fault zone can be traced from the Gorda Ridge at about longitude 127.5? As the North American crust interacts with the migrating Mendocino triple junction, the crust is first significantly thickened and then equivalently thinned over a distance of a few hundred kilometers (within a time frame of 5 m.y. The Mendocino Triple Junction (MTJ) marks the boundary where the Gorda plate, North American Plate, and Pacific Plate meet, separating the Cascadia subduction zone to the North from transform tectonics of the San Andreas plate boundary. is crustal deformation is geologically long-lived and, based on modeling, should extend several 100s of km beyond the MTJ. Known as the Mendocino triple junction, or … Three plates meet on California’s North Coast at the Mendocino triple junction. The Mendocino Triple Junction, the site where the North America, Pacific and Gorda plates meet, migrates northward with time relative to a fixed North American reference frame. The three plates are colliding, sliding past one another and overlapping. Google Scholar. We investigate the former possibility by simulating the time-dependent thermal evolution in the asthenosphere beneath California, in the wake of the migrating Mendocino triple junction (MTJ), using a two-dimensional model that represents a transect parallel to the direction of the MTJ migration. Title: The Lithospheric Structure of the Mendocino Triple Junction from Receiver Function Analysis Description: The Lithospheric Structure of the Mendocino Triple Junction from Receiver Function Analysis, Figure 2 Figure 2. The Amurian Plate, the Okhotsk Plate, and the Philippine Sea Plate is another triple junction where Mt. The Mendocino Triple Junction is to the west of Cape Mendocino under the Pacific Ocean. Failure of the Keywords: Mendocino triple junction, Gorda plate, plate boundary, deformation, fragmentation. The interactions of the Gorda, North America and Pacific plates at the Mendocino Triple Junction make it a seismically active area. Earthquakes on Gorda Plate a common event. June 23, 2009. Send. The Mendocino Triple Junction, the site where the North America, Paclific and the Gorda plates meet, migrates northward with time relative to a fixed North American reference frame. Conversely, shifting the fault to the east would be compatible with a slabless window heat source and long-distance northward translation of … Keywords: Mendocino triple junction, Gorda plate, plate boundary, deformation, fragmentation. 3).North of this triple junction, oblique subduction dominates, with the eastern margin of the Gorda plate (the … The three plate boundaries which intersect here are the Queen Charlotte Fault, the northern Cascadia subduction zone, and the Explorer Ridge. Plate boundary, a subduction margin (Atwater, 1970). Transform-Transform-Trench, Ridge-Ridge-Ridge, or abbreviated F-F-T, R-R-R). West of Cape Mendocino, the Once this hot mantle material is south of the triple junction, it will cool, stiffen, and accrete to adjacent lithosphere, eventually welding to it and moving along with it, analogous to the motion of a conveyor belt. South of the triple junction, the Pacific and North American plates are in contact across the complex San Andreas transform fault system, which approximately spans the Califor-nia Coast Ranges. Several tectonic processes combine to produce the crustal deformation observed across the Cascadia margin: (1) Cascadia subduction, (2) the northward propagation of the Mendocino Triple Junction (MTJ), (3) the translation of the Sierra Nevada–Great Valley (SNGV) block along the Eastern California Shear Zone–Walker Lane and, (3) extension in the northwestern Basin and Range, east of … Arrows point to approximate previous locations of the Mendocino Triple Junction (modified from Furlong and Schwartz, 2004). The map area also encompasses major geographic and geologic provinces of northwestern California. Another transform fault runs along the boundary between the Pacific Plate and the Gorda Plate called the Mendocino Fault (F). 1 Cos'è la tettonica a placche? This region has experienced substantial recent large earthquake activity, and quantification of these faulting processes is essential for understanding the evolution of the triple junction. The present tectonic setting of the northern California coast is strongly influenced by the triple junction and its northward movement. plate convergent margins, and may lead to refinements in the estimation of earthquake and tsunami hazard. Thirty years of seismic data (1976 - 2006) was analyzed to characterize plate geometry and stress orientations affecting the region. This fault zone evolution begins after initiation of transform motion along the plate boundary with the northward migration of the Mendocino triple junction. This development marks the change of the terminating Farallon Plate into the Juan de Fuca Plate. The Mendocino Triple Junction (MTJ) is the point where the Gorda plate, the North American plate, and the Pacific plate meet, in the Pacific Ocean near Cape Mendocino in northern California. configuration of the Mendocino Triple Junction, where the Pacific, North Ameri- ca, and southernmost Juan de Fuca (Gorda) plates meet. Diagram of the Mendocino Triple Junction. INTRODUCTION The Gorda microplate subducts northwest of the Mendocino triple junction (Atwater, 1970); evidence of deformation within the mi-croplate led Wilson (1986) to term its southern part the Gorda deformation zone (Fig. The Mendocino Triple Junction, located in the vicinity of Cape Mendocino near the town of Petrolia, is the place where three of the earth's tectonic plates meet. Migration of the Mendocino Triple Junction into the north coast region occurred largely during the Quaternary. ing Chapter 8 has a plate-tectonics emphasis. The occurrence of a M 7 earthquake is not unusual at the triple junction; over 60 earthquakes of Modified Mercalli intensity 2 VI … Such a junction exists just south of Eureka and near Cape Mendocino: It's where the Pacific, North American and Gorda plates meet. The Mendocino Triple Junction is one of the most active regions where the San Andreas Fault meets the Mendocino Fault and the Cascadia subduction zone, separating three tectonic plates. The shock occurred just north of the Mendocino Triple Junction and caused strong ground motion and moderate damage in the immediate … Only six types of triple junction are present during the current phase of plate tectonics. CORVALLIS - The strong earthquake that struck yesterday about 80 miles off the coast of Northern California was a type that's fairly common for that geologically active region and unlikely to produce a major tsunami, said researchers at Oregon State University. Both seismically imaged faults and magnetic anomalies fan eastward from N20°E near the Gorda ridge to N75°E near the triple junction. Transform-Transform-Trench, Ridge-Ridge-Ridge, or abbreviated F-F-T, R-R-R). Send. The North American plate is moving south while the Pacific plate is moving north. Mendocino Triple Junction. Lower crust-upper mantle viscous coupling plays a dominant role in converting accretionary margin materials into continent-like cru… At any boundary between two plates, they are either spreading apart (making mid-ocean ridges at spreading centers ), pushing together (making deep-sea trenches at subduction zones ) or sliding … or less).
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