Week 4 Course Material
- Lecture 7 digital presentation (pptx)
- Lecture 8 digital presentation (pptx)
- There were some landslides in Pakistan following heavy snow (up to 10′ in locations). Below is an excellent video about this from Al Jazeera.
- The Mineral, Virginia M 5.8 earthquake was felt widely in the eastern US. In contrast, the Central California M 6.0 eathquake was felt over a much smaller area. This is interesting especially because the CA earthquake was much smaller (about 650% less energy!). The difference between the east coast and the west coast is that these regions have different bedrock that absorb seismic waves differently. The east coast bedrock tends to promote seismic wave transmission. In other words, the bedrock tends to increase the distances that seismic waves can travel, compared to the west coast. On the west coast, the seismic waves get absorbed faster with distance when they travel through the bedrock.
- The CA earthquake is related to the Pacific-North America plate boundary, while the VA earthquake is a mid-plate earthquake. Here us a USGS website about the VA earthquake. Here is a map from the USGS that shows where people were that felt these two earthquakes.
- The New Madrid Earthquake of 1811 is a very interesting mid-plate earthquake. Below are two links that provide more information about this series of events that happened in 1811-1812.
- The Smithsonian Magazine website on this earthquake series.
- The USGS website on this earthquake series.
- Click on this map to see a visualization of how population density has changed with time, as compared to the ground shaking observed during the New Madrid earthquake in 1811. A new browser tab will open and one can move their mouse cursor along the timeline at the bottom of the map. This was prepared by IRIS here.
- Google Earth kmz file showing emergency spillway.
- Trees on Road Video.
— kathy_c (@Kathy_C_) February 9, 2017
Geological Society of America Timescale (click on image to download pdf file).