How far below the surface was the focus of the Seattle earthquake?

How far below the surface was the focus of the Seattle earthquake?

The most important difference here is that the earthquake occurred about 60 kilometers below the surface.

How big was the Nisqually earthquake in 2001?

magnitude 6.8
The magnitude 6.8 Nisqually earthquake in 2001 shook western Washington and beyond, seriously damaged or destroyed some buildings and roads and impacted bridges.

How is the depth of an earthquake determined?

Using the time difference of pP-P as read from the seismogram and the distance between the epicenter and the seismograph station, the depth of the earthquake can be determined from published travel-time curves or depth tables.

What was the magnitude of the 2001 Seattle earthquake?

6.8 Mw
2001 Nisqually earthquake

How far below the surface was the Seattle earthquake February 28 2001?

On Wednesday, 28 February 2001, a moment magnitude 6.8 earthquake occurred beneath the southern Puget Sound area of Washington State. The preliminary location by the University of Washington Seismological Laboratory places the earthquake at a depth of 52 km with an epicentral location of 47.149°N and 122.727°W.

When was the biggest earthquake in Washington State?

The 1965 Puget Sound earthquake occurred at 08:28 AM PDT (15:28 UTC) on April 29 within the Puget Sound region of Washington state. It had a magnitude of 6.7 on the moment magnitude scale and a maximum perceived intensity of VIII (Severe) on the Mercalli intensity scale.

When was the last big earthquake in Washington State?

The most recent major earthquake, the Nisqually quake, was a magnitude 6.8 quake and struck near Olympia, WA on February 28, 2001.

At what depth is the focus?

Focal depth It is the depth from the Earth’s surface to the region where an earthquake’s energy originates (the hypocenter or focus). The foci of most earthquakes are concentrated in the crust and upper mantle up to a depth of 700km.

What is the depth of focus in the shallow earthquake?

Earthquakes occurring at a depth of less than 70 km (43 mi) are classified as shallow-focus earthquakes, while those with a focal depth between 70 km (43 mi) and 300 km (190 mi) are commonly termed mid-focus or intermediate-depth earthquakes.

Did the 2001 Nisqually earthquake cause landslides?

Landslides occurred here again during the 2001 Nisqually earthquake and the Salmon Beach landslide is considered to be the landslide with the current highest hazard (Figure 3).