Record your answer from Lab Exercise #1, Step 1, Question 2. What time in hours:minutes:seconds GMT did the S waves arrive?…
4. The right portion of Figure 1 describes general characteristics of the ocean bottom in coastal areas that are tectonically passive (not near a plate boundary). The left portion of the figure generalizes tectonically active coastal areas. Tectonically active regions, typically associated with convergent plate boundaries, experience relatively frequent earthquakes and/or volcanic activity. You examined the locations of plate boundaries in Investigation 2A. Convergent plate boundaries are more closely associated with the [(west)(east)] coasts of the Americas.…
You have two attempts to complete this lab assignment. The average score of your two attempts…
This lab uses earthquake data to construct profiles of two convergent boundaries: the Tonga Trench and the Peru-Chile Trench. Where two tectonic plates converge, if one or both of the plates is an oceanic lithosphere, a subduction zone will form. When crust is formed at a mid-ocean ridge, it is hot and buoyant meaning it has a low density. As it spreads away from the ridge and cools and contracts, or becomes denser, it is able to sink into the hotter underlying mantle. When two oceanic plates collide, the younger of the two plates, because it is less dense will ride over the edge of the older plate. The density of the rock that makes up the subducting plate determines the way in which a plate behaves. A plate with a greater density subducts into the mantle faster and at a steeper angle than a plate with a lower density. The age of the crust involved in the subduction also affects the rate at which it subducts. Older crust is cooler and denser therefore it suducts at a steeper angle and faster than new crust at a subduction zone. The three key features associated with a subduction zone are a deep ocean trench, a volcanic arc on the overriding plate parallel to the trench, and a plane of earthquakes, shallow near the trench and descending beneath and beyond the volcanic arc. Most earthquakes occur at tectonic plate boundaries. The largest earthquakes are associated with subduction zones because they have long continuous fault lines. The depth of its focus can classify an earthquake. Earthquake depth range is divided into three zones: shallow, intermediate, and deep. Shallow earthquakes are between 0 to 70 km deep, intermediate earthquakes are between 70 to 300 km deep, and deep focus earthquakes have foci at more than 300 km.…
The reason for this is because of the buckling and stress from the movement of the tectonic plates. The epicenter of the earthquake was 60 meters below the ocean floor about 100 miles off the coast of Chile. Valdivia and Puerto Montt suffered significant damages based on how nearby they were to the center of a massive quake (extreme). The earthquake was a megathrust earthquake which is caused by the release of mechanical stress between the subducting Nazca Plate and the South American Plate which is on the Peru-Chile…
This a map showing the distribution of earthquakes from 1990 to 1996. A similar map is on page 54 in your text.…
Some of the most severe earthquakes in the United States occurred not on the Pacific Coast but in the middle of the continent in southeastern Missouri near the town of New Madrid. There are many things that were unusual about the New Madrid earthquakes of 1811-1812. The location is a surprise, the damage was catastrophic but we did learn from it.…
There are also secondary effects that can be a disastrous to Los Angeles like faulting and ground ruptures, aftershocks, and fires. Earthquakes originate from the sudden movement of faults. As the faults move, in any direction, the blocks of rock on both sides of the fault will rub against each other and that cause the vibrations. The more the faults move, the larger the amount and intensity of vibrations in the earthquake will be. The reason that Los Angeles is prone to an earthquake at any given time is because the center of the city is located directly above a group of thrust faults. These faults occur at convergent boundaries. It is also located closely the fault known as the San Andreas Fault, which has produced some of the largest earthquakes the world has ever seen. Thrust faults can give way to immense pressure, which will cause one slab of rock to push against another slab of rock and ultimately it will push the other plate upward. Earthquakes have devastated Los Angeles in the past. The largest quake in modern history was the Fort Tejon Earthquake in 1857. It measured 8.0 on the Richter scale. Southern California was scarcely populated, so…
In researching the earthquake patterns across the United States. I noticed that a majority of the earthquakes are located along the western shorelines of California and some small amounts of seismic activities in the lower parts of the south east territories of the United States. These earthquakes occur along the Pacific coast and continue southward along the Pacific coast and North along the Pacific coast.…
Iowa doesn’t get many earthquakes, but San Francisco does. There has been lots of earthquakes around that area, some too small to feel, and some too big to not. All around the southern part of the east-cost, earthquakes riddle the area. Just like how tornados are very common to us.…
There are two types of plates, oceanic and continental. Various types of movement occur along the different types of plate boundaries. Earthquakes measuring a magnitude of 1-6 are not that powerful; therefore, not much damage will be produced; however, earthquakes measuring of a magnitude of 6+ are going to be much more severe. In my opinion, Earthquakes present people with a more immediate danger and are more dangerous towards people than volcanoes, especially when cities and towns are affected. Also earthquakes have several aftershocks which a highly dangerous. An earthquake takes place when two different tectonic plates converge or transform against one another causing them to get stuck, the pressure then builds up for hundreds of years until one day the pressure releases causing earthquakes.…
Earthquakes develop in the crust of the earth. The inner parts contains a lot of energy. Some of this energy can escape through cracks which can cause volcanic activity, but most of it is stored within the earth’s inner part, contained in the crust.The earth’s outer crust has rough edges and lines making it look a bit like a jigsaw puzzle.The energy stored here causes the pieces to slide, glide, knock and move around each piece. These pieces are also known as tectonic plates.…
An instrument for automatically detecting and recording the intensity, direction, and duration of a movement of the ground, especially of an earthquake.…
vast majority of these earthquakes are too small to be felt by humans. The larger ones,…
Due to Japan being located in a region where many continental plates intersect, Japan experiences several earthquakes. Most parts of Japan also experience tidal waves. One of the worst earthquakes to take place in Japan is known as the “Great Kanto Earthquake”, this hit the Kanto plain (near Tokyo) in 1923 and over 100,000 people were killed during this incident!…