Tohoku: Observations of teleseismic strains from the 2011 Tohoku earthquake.

Description

The $M_w 9$ Tohoku earthquake happend on March 11, 2011. The seismic waves were recorded at stations across the globe, including by strainmeters in the Plate Boundary Observatory (PBO) borehole strainmeters.

Arguments

source

PBO High Frequency archive:

http://borehole.unavco.org/bsm/earthquakes/NeartheEastCoastofHonshuJapan_20110311

Details

These data are for station B084, which is located approximately 8500 km away from the epicenter. Because this distance is large, the seismic waves didn't arrive at this station for more than 700 seconds after the origin time. So there is a record of pre-seismic noise included, the timeseries extends 6784 seconds prior to the origin time, and 9215 seconds after.

The data are classified with the "epoch" variable, which separates the series into pre-seismic and seismic data; this is defined relative to the predicted P-wave arrival time from a traveltime model.

The original dataset contained NA values, which were imputed using zoo::na.locf, which fills NA with the last previous observation.

References

USGS summary page:

http://earthquake.usgs.gov/earthquakes/eqinthenews/2011/usc0001xgp/

Examples

Run this code

data(Tohoku)
str(Tohoku)

Run the code above in your browser using DataLab