magnitude-distance: Predict the level of strain expected for magnitude and...

In abarbour/deform: Crustal Deformation Modeling Tools in R

Description

Predict the level of strain expected for magnitude and distance

Usage

static(Mw, Distance.km, model = "w88")

dynamic(
  Mw,
  Distance.km,
  model = c("aw14", "bc17", "fbl20", "blf21"),
  strn.type = c("general", "areal", "diffext", "shear", "dil"),
  km2deg = NULL
)

Arguments

Mw	numeric; the moment magnitude of the earthquake
Distance.km	numeric; the epicentral distance, in kilometers
model	character; the strain-scaling model to use (see Details)
strn.type	character; the type of strain-scaling relationship to provide a prediction for
km2deg	numeric; specify the scaling coefficient used to convert the distance (in km) to degrees; this may be useful if, for example, the distance is already in degrees (then set it equal to 1)

Details

Currently the options for model are:

'static'

Static RMS strain from an earthquake (Wyatt, 1988)

'dynamic'

Dynamic RMS strain from a seismic wave: 'aw14' for Agnew and Wyatt (2014): applicable to teleseisms at thousands of km (inaccurate within 500km or so); or 'bc17' for Barbour and Crowell (2017): applicable to regional earthquakes at < 500 km (inaccurate for very short distances); or 'fbl20' for Farghal, Barbour and Langbein (2020): applicable to regional earthquakes at < 500 km (best accuracy at short distances; inaccurate > 500 km); 'blf21' for Barbour, Langbein, and Farghal (2021): best for regional earthquakes as it accounts for station and event terms in the fbl20 dataset; the basis of the M_DS magnitude scale, which is basically equivalent to Mw.

References

Agnew, D. C., and F. K. Wyatt (2014), Dynamic strains from regional and teleseismic earthquakes, Bull. Seismol. Soc. Am. 104, no. 4, 1846– 1859, doi: 10.1785/0120140007

Barbour, A., and B. Crowell (2017), Dynamic strains for earthquake source characterization, Seismol. Res. Lett. 88, no. 2A, 354–370, doi: 10.1785/0220160155

Farghal, N., A. Barbour, and J. Langbein (2020), The Potential of Using Dynamic Strains in Earthquake Early Warning Applications, Seismol. Res. Lett., in press, 1–12, doi: 10.1785/0220190385

Barbour, A., J. Langbein, and N. Farghal (2021), Earthquake Magnitudes from Dynamic Strain, Bull. Seismol. Soc. Am.m, 111 (3): 1325–1346 doi: 10.1785/0120200360

Wyatt, F. K. (1988), Measurements of coseismic deformation in southern California: 1972–1982, J. Geophys. Res. 93, no. B7, 7923–7942, doi: 10.1029/JB093iB07p07923

Examples

static(7.2, 220)
dynamic(7.2, 15000, model='aw14')

dynamic(7.2, 150, model='aw14')
dynamic(7.2, 150, model='bc17')
dynamic(7.2, 150, model='fbl20')

abarbour/deform documentation built on Feb. 15, 2022, 6:24 p.m.