Earthquake Preparedness Guide
For hundreds of millions of years, the forces of plate tectonics have shaped the Earth as the huge plates that form the Earth's surface move slowly over, under, and past each other. The largest earthquakes felt in the contiguous United States were along the New Madrid Fault in Missouri, where a three-month long series of quakes from 1811 to 1812 included three quakes larger than a magnitude of 8 on the Richter Scale
Earthquakes 101
For a QUAKE to measure one number higher on the Richter Scale, it must release ABOUT 30 times as much energy as the number below it.Every year, about 100,000 earthquakes rumble through the ground hard enough for people to FEEL them. On average, about 10,000 people die each year as a result of earthquakes.The greatest recorded earthquake ever to hit North America measured a massive 9.2
REV Lesson Plan 3 (Using earthquake depths as evidence for a subduction zone)
What type of plate boundary does the one on the west edge of South America represent? If you could follow a point on the Nazca Plate at the surface where it meets the South American Plate, where would it be in 1 million years? (What is happening to the Nazca plate over time?) Label the plates on your graph. Content Standard A: Scientific inquiry: As a result of activities, all students should develop abilities necessary to do scientific inquiry and understandings about scientific inquiry
Why are some earthquakes more destructive than others?
The strain is rarely released (as there is no active plate boundary nearby to act as a catalyst), but, when it does, it can cause an earthquake as large as a magnitude 5. These periods lasted tens of millions of years, and eventually created the Scottish Highlands, Brecon Beacons, and Peak District (among many other mountainous areas)
Earthquakes - average, low, world, daily, high, days, Why earthquakes occur, Measuring an earthquake, Understanding earthquakeswhy they are always a surprise
This earthquake belt was responsible for 70,000 deaths in Peru in May 1970, and 65 deaths and one billion dollars of damage in California in February 1971. Magnitude expresses the amount of energy released by an earthquake as determined by measuring the amplitudes produced on standardized recording instruments
Teacher's Guide - Shake, Rattle and Slide - University of Illinois Extension
11.A.3c Collect and record data accurately using consistent measuring and recording techniques from the National Geological Service and earthquakes happening throughout the world in a given time period. Late Elementary 3.A.2 Write paragraphs that include a variety of sentence types; appropriate use of the eight parts of speech; and accurate spelling, capitalization and punctuation about earth sciences
Plate Tectonics - How Earthquakes Work
But for most of history, people didn't really have any idea what caused them -- though they had some wild theories, such as the belief earthquakes were caused by air rushing out of caverns deep in the Earth's interior. The measurement is always indirect, that is, it is a measurement not of temperature itself but of the effect of temperature on some physical property of a material used in the thermometer
An example of a subduction-zone plate boundary is found along the northwest coast of the United States, western Canada, and southern Alaska and the Aleutian Islands. The outer layer, which averages about 70 kilometers in thickness, consists of about a dozen large, irregularly shaped plates that slide over, under and past each other on top of the partly molten inner layer
Fresh lava glows red hot to white hot as it flows.Why does lava take a long time to cool down?Lava cools slowly because lava is a poor conductor of heat. Mount Fuji is now a popular tourist location with a large number of climbers actively scaling the mountain top.What is a tsunami? A tsunami is a large ocean wave usually caused by an underwater earthquake or a volcanic explosion
Where Do Earthquakes Happen? - Windows to the Universe
Shop Windows to the Universe Science Store!Print copies of Spring 2011 issue of The Earth Scientist, focusing on modernizing classroom seismology education, are available in our online store
Volcanic eruptions and earthquakes are more tangible, but their cause is rooted in the theory of plate tectonics, a concept not taught until the middle school years. Baking soda and vinegar models, a staple of elementary school science, do not accurately model an eruption and could lead to the formation of misconceptions
Silica poor lava is very fluid and flows faster and much thicker A lava flow may destroy farmland, buildings and lines of communications, but rarely love of live
USGS FAQs - Earthquakes, Plate Tectonics, Earth Structure
MORE What is an earthquake and what causes them to happen? An earthquake is caused by a sudden slip on a fa MORE Can we cause earthquakes? Is there any way to prevent earthquakes? Earthquakes induced by human activity have been documented at many locations in the United States and in many other countries around the world. MORE At what depth do earthquakes occur? What is the significance of the depth? Earthquakes occur in the crust or upper mantle, which ranges from the earth's surface to about 800 kilometers deep MORE What do we know about the interior of the Earth? Five billion years ago the Earth was formed by a massive conglomeration of space materials
These changes can occur on a variety of time scales from sudden (e.g., volcanic ash clouds) to intermediate (ice ages) to very long-term tectonic cycles
This belt accounts for about 17 percent of the world's largest earthquakes, including some of the most destructive, such as the Iran shock that took 11,000 lives in August 1968, and the Turkey tremors in March 1970 and May 1971 that each killed over 1,000. The belt extends from Chile, northward along the South American coast through Central America, Mexico, the West Coast of the United States, and the southern part of Alaska, through the Aleutian Islands to Japan, the Philippine Islands, New Guinea, the island groups of the Southwest Pacific, and to New Zealand
Distribution of tidal forces during earthquakes 1900-2007 (gold) compared to distribution of all daily tidal forces during the same period (red diagonal hatched). If these 37000 miles of volcanic ridges are erupting in the first 6 months of the year and adding lava outflows to the floor of the oceans, we should be seeing a water displacement effect
You hear things like this from New Zealand now and then, including just a short time ago when the same region was struck buy a somewhat larger quake, but one apparently located farther from the center of population. When that occurs there are two major effects that may occur: One of the plates dives under the other (subduction) and the other buckles, forming mountains
Something that is unique about subduction plate boundaries (relative to convergent and transform- or sliding- plate boundaries) is that there can be very deep earthquakes. While the gigantic 8.9 magnitude earthquake is impressive even for Japan, this is a part of the planet where geologists expect large and frequent earthquakes
Sometimes the main earthquake is preceded by one or more smaller foreshocks, although these cannot be identified as foreshocks until after the main earthquake has occurred. The fault length (the length of the break along which rocks are displaced) can vary from metres for a small earthquake to about 1 000 km for a very large earthquake
That is what is happening along the San Andreas fault in California, where the Pacific plate (moving north) rubs against the American plate (moving south). The Tohoku quake was approx 12times bigger than the Nepalese quake (9.0 richter vs 7.8- every 0.1 increase is a doubling of the amount of energy released) The huge forces released (the 4th biggest since quakes have been recorded scientifically) indicate a prolonged period of system being "stuck" in layman's terms
Where do most earthquakes occur in the world
Slightly more than one week later, a more intense quake shook the Grand Canyon hard enough to wake campers and rattle nearby houses.On January 16, 1950, an earthquake centered in Apache County tore cracks in the ground throughout the tiny town of Ganado, Arizona. (MORE) Answered In Earthquakes What are The worlds most dangerous earthquakes where does it occur why does it occur when does it occur and at what places and times? the worlds most dangorus earthquake was in south America it hit a 9.2 on the rickter scale 3 people found this useful Edit Share to: Answered In Earthquakes Most earthquakes occur at the boundaries of these? Most earthquakes occur at the boundaries of the tectonic plates
Where Do Earthquakes Happen?
This time, the 'footwall' is on the 'downthrown' side of the fault, moving downwards, and the 'hanging wall' is on the 'upthrown' side of the fault, moving upwards
Hawaiian-type eruptions are rarely life threatening because the lava advances slowly enough to allow safe evacuation of people, but large lava flows can cause considerable economic loss by destroying property and agricultural lands. Mid-plate earthquakes -- those occurring in the interiors of plates -- are much less frequent than those along plate boundaries and more difficult to explain
Plate Tectonics, Earthquakes, and Volcanoes
Earth Continents showing the fit of South America and Africa Created with CAST's UDL Book Builder Plate Boundaries Where tectonic plates touch, they form what are called plate boundaries. The Rocky Mountains, west of Cheyenne, Wyoming are an example of a landform Created with CAST's UDL Book Builder Stucture of the Earth Structure of the Earth Before we discuss plate tectonics, we must first discuss the structure of the Earth
Scientists have developed a theory that explains how these giant plates move, thereby creating, destroying, and re-forming continents and oceans over long periods of time. When plates move apart, they produce new ocean floor as magma from the mantle rises up through volcanoes and deposits new rock along the plate boundaries
No comments:
Post a Comment