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Greg Hirth
James Gregory "Greg" Hirth (born June 4, 1963) is an American geophysicist, specializing in tectonophysics. He is known for his experiments in rock deformation and his applications of rheology in development of models for tectonophysics. Biography Greg Hirth as a boy and teenager enjoyed the outdoors in the woods of Ohio and the mountains of Colorado. He graduated in 1985 with a B.S. in geological sciences from Indiana University. At Brown University, he graduated in geological sciences with a master's degree in 1987 and a Ph.D. in 1991. His Ph.D. thesis was supervised by Jan Tullis. For the academic year 1991–1992, Hirth was a postdoc in the department of geology and geophysics at the University of Minnesota. There his supervisor was David L. Kohlstedt. In the department of geology and geophysics of the Woods Hole Oceanographic Institution (WHOI), Hirth was a postdoc in 1993, an assistant scientist from 1994 to 1998, and an associate scientist from 1998 to 2007 (with tenure from ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geophysicist
Geophysics () is a subject of natural science concerned with the physical processes and properties of Earth and its surrounding space environment, and the use of quantitative methods for their analysis. Geophysicists conduct investigations across a wide range of scientific disciplines. The term ''geophysics'' classically refers to solid earth applications: Earth's shape; its gravitational, magnetic fields, and electromagnetic fields; its internal structure and composition; its dynamics and their surface expression in plate tectonics, the generation of magmas, volcanism and rock formation. However, modern geophysics organizations and pure scientists use a broader definition that includes the water cycle including snow and ice; fluid dynamics of the oceans and the atmosphere; electricity and magnetism in the ionosphere and magnetosphere and solar-terrestrial physics; and analogous problems associated with the Moon and other planets.Gutenberg, B., 1929, Lehrbuch der Geophysik ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Ophiolites
Ophiolites are sequences of mafic to ultramafic rock generally believed to represent ancient oceanic lithosphere. They are distributed all across the world being all of them located at present or past orogenic belts, sites of ''mountain building'' processes. Ophiolites are common in orogenic belts of Mesozoic age, like those formed by the closure of the Tethys Ocean. Ophiolites in Archean and Paleoproterozoic domains are rare. Mediterranean and Peri-Arabic * Morais ophiolite complex, Portugal * Internal Ligurian Ophiolites in Northern Apennines, Italy * Troodos Ophiolite in the Troodos Mountains of Cyprus * Kizildag ophiolite, southern Turkey *Mirdita Ophiolite, middle Jurassic ophiolite in northern Albania between the Apulian and Pelagonian subcontinents in the Balkan Peninsula * Cap Corse ophiolite, Corsica, France * Vourinos and Pindos Ophiolites in Northern Greece and their northern extensions (numerous ophiolite bodies) in Albania, Serbia and Bosnia * Ronda peridotite, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Journal Of Geophysical Research
The ''Journal of Geophysical Research'' is a peer-reviewed scientific journal. It is the flagship journal of the American Geophysical Union. It contains original research on the physical, chemical, and biological processes that contribute to the understanding of the Earth, Sun, and Solar System. It has seven sections: A (Space Physics), B (Solid Earth), C (Oceans), D (Atmospheres), E (Planets), F (Earth Surface), and G (Biogeosciences). All current and back issues are available online for subscribers. History The journal was originally founded under the name ''Terrestrial Magnetism'' by the American Geophysical Union's president Louis Agricola Bauer in 1896. It was renamed to ''Terrestrial Magnetism and Atmospheric Electricity'' in 1899 and in 1948 it acquired its current name. In 1980, three specialized sections were established: ''A: Space Physics'', ''B: Solid Earth'', and ''C: Oceans''. Subsequently, further sections have been added: ''D: Atmospheres'' in 1984, ''E: Planets' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geology (journal)
''Geology'' is a peer-reviewed publication of the Geological Society of America (GSA). GSA stated (in 2006) (ISSN 0091-7613) that it is the most widely read scientific journal in the field of earth science. It is published monthly, with each issue containing 20 or more articles. One of the goals of the journal is to provide a forum for shorter articles (four pages each) and less focus on purely academic research–type articles. According to the ''Journal Citation Reports'', the journal had a 2020 impact factor of 5.399. The journal is indexed in Scopus and SCImago The SCImago Journal Rank (SJR) indicator is a measure of the prestige of scholarly journals that accounts for both the number of citations received by a journal and the prestige of the journals where the citations come from. Etymology SCImag .... See also * List of scientific journals ** List of earth and atmospheric sciences journals References External links *Geology — Browse Issues [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
American Geophysical Union
The American Geophysical Union (AGU) is a 501(c)(3) nonprofit organization of Earth, Atmospheric science, atmospheric, Oceanography, ocean, Hydrology, hydrologic, Astronomy, space, and Planetary science, planetary scientists and enthusiasts that according to their website includes 130,000 people (not members). AGU's activities are focused on the organization and dissemination of scientific information in the interdisciplinary and international fields within the Earth and space sciences. The geophysical sciences involve four fundamental areas: atmospheric sciences, atmospheric and ocean sciences; solid-Earth sciences; hydrologic sciences; and space sciences. The organization's headquarters is located on Florida Avenue in Washington, D.C. History The AGU was established in December 1919 by the United States National Research Council, National Research Council (NRC) to represent the United States in the International Union of Geodesy and Geophysics (IUGG), and its first chairman w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Southwest Indian Ridge
The Southwest Indian Ridge (SWIR) is a mid-ocean ridge located along the floors of the south-west Indian Ocean and south-east Atlantic Ocean. A divergent tectonic plate boundary separating the Somali plate to the north from the Antarctic plate to the south, the SWIR is characterised by ultra-slow spreading rates (only exceeding those of the Gakkel Ridge in the Arctic) combined with a fast lengthening of its axis between the two flanking triple junctions, Rodrigues () in the Indian Ocean and Bouvet () in the Atlantic Ocean. Geological setting Spreading rates The spreading rate along the SWIR varies: the transition between slow (30 mm/yr) and ultra-slow (15 mm/yr) spreading occur at magnetic anomaly C6C (ca. 24 Ma). This occurs between 54°–67°E, the deepest, and perhaps coldest and most melt-poor, part of Earth's mid-ocean ridge system. Crustal thickness decreases quickly as spreading rates drop below c. 20 mm/yr and in the SWIR there is an absence ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mecca Hills
The Mecca Hills are a low mountain range located in Riverside County, southern California, in the United States. The Mecca Hills are in the Colorado Desert section of the Sonoran Desert, adjacent to the Lower Colorado River Valley region. The range lies in an east-west direction, east of the Coachella Valley, west of the Chuckwalla Mountains, and south of Interstate 10. The Mecca Hills are north of the Salton Sea and south of Joshua Tree National Park, with the Orocopia Mountains to the southeast. Wilderness Established in 1994 by the U.S. Congress, the U.S. Bureau of Land Management manages the 26,356 acre Mecca Hills Wilderness. The designated wilderness area Wilderness or wildlands (usually in the plural) are Earth's natural environments that have not been significantly modified by human activity, or any nonurbanized land not under extensive agricultural cultivation. The term has traditionally ... includes narrow steep-walled canyons that create a natural maze with ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Central Australia
Central Australia, also sometimes referred to as the Red Centre, is an inexactly defined region associated with the geographic centre of Australia. In its narrowest sense it describes a region that is limited to the town of Alice Springs and its immediate surrounds including the MacDonnell Ranges. Commonly, it refers to an area up to from Alice Springs, in every direction. In its broadest use it can include almost any region in inland Australia that has remained relatively undeveloped, and in this sense is synonymous with the term Outback. In a modern, more formal sense it can refer to the administrative region used by the Northern Territory government, as of 2022. Centralia is another term associated with the area, most commonly used by locals. Administrative region of the NT Economic region There are six regions in the Northern Territory for the purposes of economic planning, as defined by the Northern Territory Government: * Central Australia * Darwin, Palmersto ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trinity County, California
Trinity County is a county located in the northwestern portion of the U.S. state of California. Trinity County is rugged, mountainous, heavily forested, and lies along the Trinity River (for which it is named) within the Salmon, Klamath Mountains, as well as a portion of the Scott, Trinity, and North Yolla Bolly Mountains. It is also one of three counties in California with no incorporated cities (the other two counties in California with that distinction are Alpine and Mariposa counties). As of the 2020 census, the population was 16,112, making it the fifth least-populous county in California, and the least-populous of California's 27 original counties. The county seat and largest community is Weaverville. History Trinity County has a rich history of Native Americans: Tsnungwe including the South Fork Hupa and tł'oh-mitah-xwe, Chimariko, and Wintu. The county takes its name from the Trinity River, which was in turn named in 1845 by Major Pierson B. Reading, who was ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chiwaukum Mountains
The Chiwaukum Mountains are a north–south mountain range in central Washington, United States. They stretch from Snowgrass Mountain at , to . The mountains are made of schist, part of the Nason terrane. The original rock in the Nason terrane was laid down 210 Myr ago. The terrane then smashed into the western coastline of the continent, and the Mount Stuart batholith intruded into it in the late Cretaceous. The intrusion of the granitic rock metamorphosed the rock into schist. In July 2014, the lightning-caused Chiwaukum Creek Fire burned the east flank of the Chiwaukum Mountains. Partial list of peaks: * Big Chiwaukum – 8,081' (2463m) – * Snowgrass Mountain – 7,993' (2436m) – * Big Lou – 7,780' (2370m) – * Big Jim Mountain – 7,765' (2367m) – * Ladies Peak – 7,708' (2349m) – * Grindstone Mountain – 7,533' (2296m) – * Cape Horn – 7,316' (2230m) – * Bulls Tooth – 6,840' (2080m) – Nearby peaks: * Jim Hill Mountain ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cascade Mountains
The Cascade Range or Cascades is a major mountain range of western North America, extending from southern British Columbia through Washington and Oregon to Northern California. It includes both non-volcanic mountains, such as many of those in the North Cascades, and the notable volcanoes known as the High Cascades. The small part of the range in British Columbia is referred to as the Canadian Cascades or, locally, as the Cascade Mountains. The highest peak in the range is Mount Rainier in Washington at . part of the Pacific Ocean's Ring of Fire, the ring of volcanoes and associated mountains around the Pacific Ocean. All of the eruptions in the contiguous United States over the last 200 years have been from the Cascade Volcanoes. The two most recent were Lassen Peak from 1914 to 1921 and a major eruption of Mount St. Helens in 1980. Minor eruptions of Mount St. Helens have also occurred since, most recently from 2004 to 2008. The Cascade Range is a part of the American Cordil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
