In these maps that are zoomed in on the area around Ferndale, both show different metrics for shaking. The distribution of instrumentally observed shaking for this event is exceptionally well recorded, and the most reliable indicators of shaking are seismic station recordings, shown on the left (USGS). Here the contours indicate Peak Ground Acceleration (PGA); in California, building damage begins at about 10% g, becomes widespread at 20% g, and highly destructive at 50% g. Notice that the greatest shaking is not closest to the epicenter or site of peak slip. The colored circles show “Did You Feel It” estimates for shaking. On the right figure, which shows Temblor’s site amplification model (STAMP ) the river valleys and coastal estuaries, which are filled with unconsolidated sediments, all show up as red areas that amplify seismic waves, which means more shaking.

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In these maps that are zoomed in on the area around Ferndale, both show different metrics for shaking. The distribution of instrumentally observed shaking for this event is exceptionally well recorded, and the most reliable indicators of shaking are seismic station recordings, shown on the left (USGS). Here the contours indicate Peak Ground Acceleration (PGA); in California, building damage begins at about 10% g, becomes widespread at 20% g, and highly destructive at 50% g. Notice that the greatest shaking is not closest to the epicenter or site of peak slip. The colored circles show “Did You Feel It” estimates for shaking. On the right figure, which shows Temblor’s site amplification model (STAMP ) the river valleys and coastal estuaries, which are filled with unconsolidated sediments, all show up as red areas that amplify seismic waves, which means more shaking.

In these maps that are zoomed in on the area around Ferndale, both show different metrics for shaking. The distribution of instrumentally observed shaking for this event is exceptionally well recorded, and the most reliable indicators of shaking are seismic station recordings, shown on the left (USGS). Here the contours indicate Peak Ground Acceleration (PGA); in California, building damage begins at about 10% g, becomes widespread at 20% g, and highly destructive at 50% g. Notice that the greatest shaking is not closest to the epicenter or site of peak slip. The colored circles show “Did You Feel It” estimates for shaking. On the right figure, which shows Temblor’s site amplification model (STAMP ) the river valleys and coastal estuaries, which are filled with unconsolidated sediments, all show up as red areas that amplify seismic waves, which means more shaking.

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