lesson 16 - Key Terms and Concepts - geologic hazard -...

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Key Terms and Concepts - geologic hazard - internal structure of the Earth - crust - mantle: asthenosphere, lithosphere - plate tectonics - magma, lava - sea-floor spreading - types and directions of plate movements - convergence, in detail - divergence, in detail - Ring of Fire - earthquake & hazards associated with - tsunami & hazards associated with - volcano & hazards associated with - hot spots - types of volcanoes - mass wasting & hazards associated with - Richter magnitudes - hazard preparedness and recovery Introduction to Geologic Hazards Did you ever wonder if a volcanic eruption could really happen in the U.S., or why California is prone to earthquakes, or what causes a tsunami - ? Earthquakes, volcanoes, and tsunamis are three of the four major geologic hazards that we are going to explore in this lesson and, as you will see, all three are closely linked to one another. In short, geologic hazards are "any geological or hydrological processes that pose a threat to people or their property or both" (National Park Service). Photo of earthquake hazard Loma Prieta, CA, Earthquake on October 17, 1989 : "Partially razed earthquake-damaged un-reinforced masonry buildings in Old Town historical district, City of Salinas"
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always on the verge of reshaping the landscape above. In this lesson we will explore these processes, focusing specifically on the way they reveal themselves on the surface and how they affect the lives of people living there. With this in mind, we will begin with a discussion on plate tectonics, which is the catalyst for earthquakes, volcanoes, and tsunamis, and sometimes even mass wasting (the fourth geologic hazard we will look at). The first geologic hazard we will discuss is volcanoes, which are perhaps the most intriguing phenomena given their explosive potential. After that we will focus on earthquakes. In your lifetime, thousands of earthquakes have already occurred in the United States and abroad, most of which are small, but some of which are catastrophic like the ones that occurred in Italy in April 2009, China in May 2008, and Java, Indonesia in May 2006. Which brings us to our next topic: tsunamis. Just the mention of Indonesia often sparks memories of the devastating tsunami that occurred there in December of 2004. In this part of the lesson we will discuss the physical nature of tsunamis, as well as this particular event in detail. Photos of volcanic hazards Mount St. Helens volcano erupted on May 18, 1980 : "Mount St. Helens and the devastated area is now within the 110,000-acre Mount St. Helens National Volcanic Monument, under jurisdiction of the United States Forest Service. Visitor centers, interpretive areas, and trails are being established as thousands of tourists, students, and scientists visit the monument daily. Mount St. Helens is once again considered to be one of the most beautiful and interesting of the Cascade volcanic peaks." Image source:
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lesson 16 - Key Terms and Concepts - geologic hazard -...

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