potential earthquake hazards and their effects

Although earthquakes cause death and destruction through such … They also can block roads and disrupt utility lines. The first main earthquake hazard (danger) is the effect of ground shaking. Buildings can also be damaged by strong surface waves making the ground heave and lurch. A year ago today, the prime minister's chief science adviser, Sir PETER GLUCKMAN, gave the Government a briefing paper on the likely psychosocial effects of the earthquakes. A number of waves may be produced and they can travel long distances at high speeds to flood far-off shores. ( Log Out /  Buildings can be damaged by the shaking itself or by the ground beneath them settling to a different level than it was before the earthquake The fourth main earthquake hazard is fire. People can escape tsunamis by moving to higher ground or far inland after ground shaking stops. These all affect the way the seismic waves travel through the ground. Liquefaction is a hazard in areas that have groundwater near the surface and sandy soil. ( Log Out /  If you are on a personal connection, like at home, you can run an anti-virus scan on your device to make sure it is not infected with malware. Potential Earthquake Hazards and their Effects - View presentation slides online. Earthquake hazards include any physical phenomenon associated with an earthquake that may produce adverse effects on human activities. What is it like to face a tsunami? An earthquake can rupture (break) dams or levees along a river. Most of the hazards to people come from man-made structures themselves and the shaking they receive from the earthquake. People can't be shaken to death by an earthquake. A large earthquake will always be followed by a sequence of aftershocks. If liquefaction occurs under a building, it may start to lean, tip over, or sink several feet. While they are often used as synonyms, it is useful to distinguish between “hazards” and “risk”. Ground shaking: Ground shaking is both a hazard created by earthquakes and the trigger for other hazards such as liquefaction and landslides. The ground firms up again after the earthquake has past and the water has settled back down to its usual place deeper in the ground. If a structure (a building, road, etc.) ( Log Out /  Coastal areas can become permanently flooded as a result. The real dangers to people are being crushed in a collapsing building, drowning in a flood caused by a broken dam or levee, getting buried under a landslide, or being burned in a fire. 0 In coastal areas, a powerful offshore quake could trigger a tsunami, a… Earthquake Hazards. Buildings can even sink into the ground if soil liquefaction occurs. Sometimes the resulting harm is referred to as the hazard instead of the actual source of the hazard. Search Search Looking for the presentations from the 2020 CREW:Cacsadia Electrical Power Resilience Symposium Proceedings click on the link. This separates the grains from each other, reducing their load bearing capacity. Secondary earthquake hazards are those that are caused by the primary hazards, and may often be more catastrophic: Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. Home They occur on lakes that are shaken by the earthquake and are usually only a few feet high, but they can still flood or knock down houses, and tip over trees. h�bbd``b`�$�C�`�$�>��@"�$$� ��L��@b����~0 �� Figures 1 and 2 from Walker, 1982; Figures 3 and 4 from Bolt, 1993; Figure 5 from. Basically, a hazard is the potential for harm or an adverse effect (for example, to people as health effects, to organizations as property or equipment losses, or to the environment). Groundshaking due to earthquakes destabilises cliffs and steep slopes, causing landslides and rockfalls as a significant side-effect. In the largest earthquakes whole districts can be devastated by the multiple consequences of ground shaking. These include ground shaking, landslides, liquefaction, and in some areas, tsunamis. �> �4$4q���;��$����"��s�}��@'�Ѕ$��HF��{D�T��#�!��H�����l��HGZ�|;�蝑�V���D��x,0���b�B��y!�0f�|���=:V[=m���Ð. Performance & security by Cloudflare, Please complete the security check to access. Learn more about earthquake hazards in your area. The ground shaking may also cause landslides, mudslides, and avalanches on steeper hills or mountains, all of which can damage buildings and hurt people. Hazards are the natural phenomena that might impact a region, regardless of whether there is anyone around to experience them or not. The international workshop on "Earthquake Hazards and Mitigation" was held in Guwahati, India during 7-8 December 2007. Ground shaking describes the vibration of the ground during an earthquake. In New Zealand there are large lakes that could be affected, for example Lakes Wakatipu and Wanaka that are near to the Alpine Fault. Subsidence can also occur as ground shaking causes loose sediments to “settle’ and to lose their load bearing strength (see liquefaction, below) or to slump down sloping ground (see Landslides and Rockfalls). Most earthquake damage results from the shaking caused by seismic waves passing beneath buildings, roads, and other structures. A large earthquake will always be followed by a sequence of aftershocks. A tsunami is what most people call a tidal wave, but it has nothing to do with the tides on the ocean. Tsunamis and seiches can also cause a great deal of damage. Change ), You are commenting using your Google account. zEarthquakes located in isolated areas far from human population rarely cause any deaths. For example, during the 2001 Nisqually earthquake that shook the Puget Sound region, buildings crumbled, bridge supports cracked, and more than 400 people were injured. h�b```f``� ��|� ���]L}����}�����жfF�0i��'{l��!�p������0S hZ�@����� b�H� �s,��^'=�E�5���ZV3- �+10�`Ҍ@�Ī���@��� 3�+� A hazard is any source of potential damage, harm or adverse health effects on something or someone. For an explanation of the exceptional high energy of the Christchurch earthquakes in 2011 have a look at this video. Tsunamis can be tens of feet high when they hit the shore and can do enormous damage to the coastline. Lateral spreading occurs where sloping ground starts to move downhill, causing cracks to open up, that are often seen along hill crests and river banks. The type of hazard depends on the strength of seismic activity, along with such factors as local topographic and built features, subsurface geology and groundwater. For example, after the Great San Francisco Earthquake in 1906, the city burned for three days. The third main hazard is flooding. When the water and soil are mixed, the ground becomes very soft and acts similar to quicksand. Earthquake Hazards and Risks Earthquake Risk zMany seismologists have said that "earthquakes don't kill people, buildings do". • Tsunamis can injure or kill many people and cause significant damage to buildings and other structures. Another way to prevent getting this page in the future is to use Privacy Pass. Read about The Earth in more detail here. Change ). Liquefaction can undermine the foundations and supports of buildings, bridges, pipelines, and roads, causing them to sink into the ground, collapse or dissolve. Some movies show scenes with the ground suddenly opening up and people falling into fiery pits, but this just doesn't happen in real life. Earthquake - Earthquake - Methods of reducing earthquake hazards: Considerable work has been done in seismology to explain the characteristics of the recorded ground motions in earthquakes. The first main earthquake hazard (danger) is the effect of ground shaking. The aftermath of liquefaction can leave large areas covered in a deep layer of mud. The first main earthquake hazard (danger) is the effect of ground shaking. hޤ��n�0@ŏ�X֗��B�RZ�K� endstream endobj startxref Check out this video about the Rockfall Impacts of the Christchurch Quake, and this one: Laser Scanning Christchurch Rockfalls. Scribd is the world's largest social reading and publishing site. Different parts of Cascadia will experience different hazards. The type of hazard depends on the strength of seismic activity, along with such factors as local topographic and built features, subsurface geology and groundwater. endstream endobj 64 0 obj <> endobj 65 0 obj <> endobj 66 0 obj <>stream / Earthquake Hazards. Rockfall Impacts of the Christchurch Quake. In some cases, waves may be up to 33 feet (10 meters) high, flooding everything in their path. It is a huge wave caused by an earthquake under the ocean. The fourth main earthquake hazard is fire. / Earthquakes Risk refers to what we stand … Liquefaction: Liquefaction describes the way in which soil liquefies during ground shaking. Failed bridges can disrupt or cut off entire communities. The water from the river or the reservoir would then flood the area, damaging buildings and maybe sweeping away or drowning people. So we created a quick page to help you find any of the documents we were to have uploaded on the USB stick. Different parts of Cascadia will experience different hazards. Cloudflare Ray ID: 5e2466176ab634fb When the vibrations stop the sediments settle down again, squeezing groundwater out of fissures and holes in the ground to cause flooding. Earthquake hazards include any physical phenomenon associated with an earthquake that may produce adverse effects on human activities.

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