Seismology

Questions & Answers

A, B, and C represent the first arrival of different types of seisimc waves from the same earthquake. What type of wave is arriving at C


In your own words, explain why the arrival times of P-waves and S-waves can be used to determine the distance from the earthquake to the instrument.


A, B, and C represent the first arrival of different types of seisimc waves from the same earthquake. What type of wave is arriving at A?


What is the approximate lag time between the first P and first S-waves for an earthquake that is about 500 km away?


What is the minimum number of seismic stations required to identify the location of an earthquake's epicenter?


A, B, and C represent the first arrival of different types of seisimc waves from the same earthquake. What type of wave is arriving at B?


The P-waves from an earthquake strike our seismic station at 3PM. The S-waves from the same earthquake arrive about 41 seconds later. We conclude that the epicenter of the earthquake is about km away.


Which of the following statements is TRUE for the plate boundary mentioned in question 26? a. For this type of plate boundary, volcanism would be expected to be formed from mostly intermediate (andesitic) magmas forming a volcanic arc. b. This type of plate boundary would be characterized by basaltic (mafic) volcanism creating a mid-ocean ridge. c. This area would be dominated by “hot-spot" volcanism yielding either mafic or silicic (rhyolitic) volcanism. d. There would be no volcanism at this type of plate boundary.


1. How does the theory of plate tectonics explain the recycling of old oceanic crust and the formation of new oceanic crust? 2. Describe a complete Wilson Cycle, as presented in Topic in Depth 2.10. 3. Compare and contrast the geologic characteristics of the continental margins of the west and east coasts of North America. 4. Explain the significance of volcanic hot spots. How do they relate to the development of chains of islands and seamounts?(See Topic in Depth 2.6; or access animation at:https://www.iris.edu/hq/inclass/animation/hotspot_volcanic_island_stages_in_the_life


For each of the following statements indicate the lineation pattern that best matches. Mid-ocean Ridge A.Mid-ocean Ridge B.Mid-ocean Ridge C. 31.Ridge with slowest rate of seafloor spreading. 32.Ridge with moderate rate of seafloor spreading. 33.Ridge with fastest rate of seafloor spreading. 34) Ridge whose 2 spreading rate (rate of spreading for one side of the plate) for the last 5 Ma(million years) is approximately 28 km/Ma. 35.Ridge with line showing longest length of seafloor.


For each of the following statements indicate the volcanic construct that BEST matches. 37.Composite cone (strato volcano). 38.Shield Volcano. 39.Dominated by pyroclastics (tephra). 40 ) Composed of alternating layers of lava and pyroclastic material (tephra). 41. Mostly associated with Subduction Zone settings. 42.Most associated with oceanic Hot Spot settings. 43.Flood Basalt. 44.Explosive eruptions. 45.Dominated by lava flows.


Oceanic portions of the North American Plate (NA) have two different plate boundaries with respect to the Caribbean Plate (CB). The plate boundary bounding the northern-most part of the Caribbean Plate (CB) is: a. Subduction Zone with the North American and South American plates subducting to the west underneath the Caribbean Plate (CB). b. Subduction Zone with the Caribbean Plate (CB) subducting to the east under the North American (NA) and South American (SA) Plates. c. Divergent boundary d. Transform Boundary. e. None of the above statements are true.


Which of the following statements is TRUE for the plate boundary mentioned in question 26? b. This type of plate boundary is characterized by only moderate earthquakes. a. This type of plate boundary is characterized by the strongest earthquakes. c. This is the same type of plate boundary that we see in the San Francisco Bayregion. d. Both b and c are correct. e. None of the above statements are true.


For questions 46 through 50 please refer to Figure X5, the topographic map of the Logan Pass quadrangle, Colorado Questions 46 through 50: More True/False Note: True (a) False (b) For each of the following statements determine whether it is true or false.. 46.This area shows signs of past glaciation. 47 )The shape of the valley that extends from H2 through E4, Preston Park, is V-shaped, typical of stream carved canvons. 48 The slope gradient of the major stream in the valley mentioned in question 47 is gentler than you would expect for a youthful stream in an alpine environment. 49.The Valley mentioned in question 47 is an example of a "hanging valley." 50.This area is typical of a desert landscape.


Oceanic portions of the North American Plate (NA) have two different plate boundaries with respect to the Caribbean Plate (CB). The plate boundary bounding the northern-most part of the Caribbean Plate (CB) is: b. Subduction Zone with the Caribbean Plate (CB) subducting to the east under the North American (NA) and South American (SA) Plates. c. Divergent boundary.с. d. Transform Boundary. e. None of the above statements are true.


Oceanic portions of the North American Plate (NA) have two different plate boundaries with respect to the Caribbean Plate (CB). To the east along with the South American Plate (SA) you have a:26. a. Subduction Zone with the North American and South American plates subducting to the west underneath the Caribbean Plate (CB). b. Subduction Zone with the Caribbean Plate (CB) subducting to the east under theNorth American (NA) and South American (SA) Plates. c. Divergent boundary. d. Transform Boundary. e. None of the above statements are true.


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