![]() The shakemap doesn't distinguish between the land and ocean, so for areas along the coast, like this Northridge quake, it can be helpful to clip the shapefile to the land border to provide geographic context. I'll be converting the PGV map to a 3D model, but the same steps apply for any of the other shapefiles in the archive. You can read about these various measurements. PGA is peak ground acceleration, PGV is peak ground velocity, and MMI is Modified Mercalli Index. The shapefile download of an earthquake contains multiple shapefiles that represent different measurements of shaking. The specific shapefile download that we'll use is here. On the page for a specific earthquake you can find the shapefile downloads under Downloads > GIS File > Shape Files. This tutorial will map the Southern California Northridge earthquake of 1994. For this tutorial we'll focus on a few major historical earthquakes. The scenarios are modeled hypothetical earthquakes that might occur as worst-case scenarios along major fault lines. You can find both historical earthquakes as well as scenarios. ![]() Any large earthquake can be found in their archive of shakemaps. The USGS uses a worldwide network of sensors to automatically produce shakemaps of all major earthquakes that occur throughout the world. ![]()
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