Hot plate

Home Part of Exam 2 Geology of California Plate Tectonics Plate tectonics is the theory that Earth's outer shell is divided into several plates that glide over the mantle, the rocky inner layer above the core. Compared to the mantle, the plates are a hard, tough, and rigid shell. California is made up of different types of plates that are unique in the way that they form and move. (LiveScience) One of the biggest plates in California is the pacific plate, which is moving in a northwest direction

evidence towards proving that plate tectonics theory is valid. A seismic event is the transient motion and release of kinetic energy caused by sudden failure of the earth's crust, usually felt as shaking or tremors in the rock mass. Seismic events range in size from barely perceptible tremors to major earthquakes. Volcanic events occur when there is a release of magma, gas and ash from the Earth’s crust. The entire outer surface of the planet is divided into these plate formations with approximately

as a hot spot for seismic activity. A subduction zone is a region on the crust of the earth where two tectonics plate meet one another. The area where the two plates meet is called a plate boundary. When two plates meet at a subduction zone, they converge towards each other, and one these tectonic plates come into contact with each other, one bends and slides underneath another, resulting in one curving down to the mantle. In this circumstance when subduction is taking place the denser plate is the

asthenosphere thins. 7. The age of the seafloor is youngest at oceanic ridges and ages symetrically on either side from there. This led Hess to theorize that the seafloor spread to cause continental drift. The midoceanic ridge is a spreading center, where hot magma emerges from the upper mantle to create new seafloor. Supporting this is the magnetism of the seafloor, which have bands that are magnetic anomalies parallel to the midoceanic ridges. The bands coincide with known polar reversals, which supports

Plate tectonic activity is related to many other things like, volcanoes and earthquakes. These natural hazards can be found in linear belts around the globe. There are seven large plates and many small ones, the main types of plates include the divergent plate boundary (pulls away), convergent plate boundary (move towards each other) and transform plate boundary (slide past). Ocean-continent boundaries create earthquakes up 700

a continent can keep spreading to the point where it is split in two, thus creating an ocean basin between the two sides and ridge system between. The proposed mechanisms for continental rifting can be boiled down to two things: hot mobile rock plumes and forces from plate motion. Continental rifting signifies the beginning of continental separation where extension can lead to lithospheric rupture and result in the creation of a new ocean basin. If the rifting process reaches the rupture point, the

as a hot spot for seismic activity. A subduction zone is a region on the crust of the earth where two tectonics plate meet one another. The area where the two plates meet is called a plate boundary. When two plates meet at a subduction zone, they converge towards each other, and one these tectonic plates come into contact with each other, one bends and slides underneath another, resulting in one curving down to the mantle. In this circumstance when subduction is taking place the denser plate is the

On May 18, 1980, 35 years prior to today, a quake struck underneath the north face of Mount St. Helens in Washington state, setting off the greatest avalanche in written history and a significant volcanic emission that dispersed powder over twelve states. The sudden horizontal impact, heard many miles away, removed 1,300 feet off the highest point of the volcano, sending shockwaves and pyroclastic streams over the encompassing scene, leveling backwoods, softening snow and ice, and creating monstrous

Article Summary of What Lies Beneath in America? Submitted by Dina Martinez El Centro College GEOL 1401, Section 51426, Fall 2014 Article Summary of What Lies Beneath in America? USArray is a huge seismology project. The purpose is to basically take an ultrasound of the contiguous United States to understand the past and possibly the future of what goes on underneath the surface. Our current picture is mostly blurry, full of educated guesses and theories. By capturing all the sounds underneath

[1982, 1984, 1989] examined the environments that lead to the formation of a subduction zone from a passive margin. Their results revealed that subduction was achieved due to sediment loading if the oceanic plate was younger than ∼20 Myr. There results also suggested that the aging of the plate was detrimental rather than beneficial to the initiation of subduction. Regenauer-Lieb et al. [2001] also studied the formation of a subduction zone due to sediment loading at a passive margin. They suggested