Examples of regional metamorphic rocks include schist and gneiss. Thermal metamorphic rocks, also known as contact metamorphic rocks, are formed by extreme heat along with quite a bit of pressure. The pressure pushes the molten rock against the Earth's surface, causing it to recrystallize. Examples of thermal metamorphic rocks are marble and sandstone
It increased by 7 ft a day.” Earthquakes You can predict when a volcano will erupt because you get earthquakes. This is because most volcanoes follow a regular pattern of increasing seismic activity as the eruption is about to take place, usually in the form of small earthquakes. Scientist use special equipment seismometers that tell and record earthquakes that happen underneath the volcano. Long period earthquakes- are beneath volcanoes and are believed that it is caused by magma moving through cracks that then shake the ground. Short period earthquakes- earthquakes under the volcanoes that is believed to be caused by rock breaking events Both types of
The first disaster causes a lot of fires in the forests. Also, it throws a lot of volcanic gases which causes air pollution, such as, ash fall, CO2, and methane. "Mud volcanoes are one of the significant natural sources of atmospheric methane"(Dimitrov, 2002). The volcanoes affect the lands and cause landslides. On the other hand, the second disaster affects the cities more than the forests.
d. They change direction and intensity when they encounter different material. 13. What are shallow, intermediate, and deep earthquake classifications based on? [pic] a. frequency of the largest wave b. the amount of damage [pic] c. the depth of the focus d. amplitude of the largest wave 14. According to the seismogram shown in the figure, which wave is the fastest?
Discuss the view that the impact of earthquake hazards depends primarily on human factors [40] An earthquake is a tremor or shockwave in the earth’s crust that is caused by the sudden movement of the crust, resulting in the earth shaking. Most earthquakes are a consequence of tectonic plate movement by tension causing a sudden release of energy or rubbing. These normally occur at plate margins or along fault lines and can cause hazards which need to be prevented where possible. Earthquakes can therefore occur at all plate boundaries, destructive, constructive and conservative but the most damaging tend to happen at destructive margins where the earthquakes have a high magnitude due to the rubbing of the oceanic and continental crusts. A hazard is a natural event that has the potential to effect both life and property.
The point on the Earth's surface directly above the hypocenter is called the epicenter of the earthquake. The closer you are to the epicenter of the earthquake, the more dangerous and devastating. The severity of an earthquake can be expressed in terms of both intensity and magnitude. Although the two terms are very different, they are often confused with each other. Intensity is based on the observed effects taken place during the earthquake, for instance the ground shaking underneath people, buildings, and natural features.
The reason for the movement is convection currents originating in the core caused by radioactive decay. Knowing the theory of plate tectonics is a useful tool in understanding the distribution of earthquakes and volcanoes as they correlate very closely. If we map out the location of major earth quakes, location of active volcanoes and a map of general plat tectonic, the 3 would overlap. This gives us a general idea of locations and correlations. Each boundary between 2 plates have the capability of being a different type of boundary.
A sedimentary rock is a rock made out of sediments that compacted and cemented together. Metamorphic rock is the result of rocks that have gone through heat and pressure. Three common metamorphic rocks are schist, marble, and gneiss. Metamorphic rocks are denser than most rocks. Temperature can heavily effect how a metamorphic rock changes.
This would explain why the island (thought to be due to a mud volcano) appeared off the coast of Pakistan this fall at about the same time as the large earthquake. Seismic waves of larger earthquakes are thought to trigger subsequent mud volcano eruptions up to a year after the event. The role the seismic waves play is not yet fully understood. Other tectonic activity, sedimentary loading due to rapid sedimentation, and continuous hydrocarbon accumulation are said to also control the occurrence of mud volcanoes. On a
‘How do people and society respond to environmental hazards and what factors influence their choice of adjustments?’ (Cutter 1996). Discuss this statement with reference to examples of both natural and technological hazards. Introduction Environmental hazards fall under two headings: Chronic and Catastrophic. Catastrophic hazards are those with a high magnitude and low frequency. They create huge media attention as the rate of change from what would have been considered as ‘normal’ conditions is very high, for example an earthquake can turn an entire city to ruins and kill hundreds of people in just minutes.