ask_2014_nga: The GMPE of ASK 2014

In wltcwpf/GMPE: A pacakge of commonly used Ground Motion Prediction Equations (GMPE)

The GMPE of ASK 2014

Description

This function calculates the ground motion median values and standard deviations

Usage

ask_2014_nga(
  M,
  T = 1000,
  CRjb = 999.9,
  Rrup,
  Rjb,
  Rx,
  Ry0 = 999,
  Ztor = 999,
  dip,
  lambda,
  after_shock = 0,
  HW,
  W = 999,
  Z10 = 999,
  Vs30,
  Vs30_code,
  region
)

Arguments

M	Moment magnitude, a numeric value
T	Period (sec); Use Period = -1 for PGV computation. Use 1000 (by default) for output the array of Sa with original NGA West2 periods
CRjb	Centroid CRjb, assumed to be 999.9 here -> assume no aftershock
Rrup	Closest distance (km) to the ruptured plane
Rjb	Joyner-Boore distance (km); closest distance (km) to surface projection of rupture plane
Rx	Site coordinate (km) measured perpendicular to the fault strike from the fault line with down-dip direction to be positive
Ry0	Horizontal distance off the end of the rupture measured parallel to strike. 999 if unknown
Ztor	Depth(km) to the top of ruptured plane. 999 if unknown
dip	Fault dip angle (in degree)
lambda	Rake angle (in degree)
after_shock	Flag for aftershocks. 0 for Class 1 (no aftershock), 1 for Class 2.
HW	Falg for hanging wall sites. 1 for sites on the hanging wall side of the fault, 0 otherwise.
W	Down-dip rupture width (km). 999 if unknown
Z10	Basin depth (km): depth from the groundsurface to the 1km/s shear-wave horizon. 999 if unknown.
Vs30	Shear wave velocity averaged over top 30 m (in m/s). Reference site condition is 1130 m/s.
Vs30_code	Code for Vs30 measurement. 0 for measured Vs30; 1 for inferred Vs30
region	Region indicator: 0 for global; 1 for California; 2 for Japan; 3 for China; 4 for Italy; 5 for Turkey; 6 for Taiwan.

Value

A list of five elements is returned: med - median spectral acceleration prediction (in g); sigma - logarithmic standard deviation of spectral acceleration prediction; phi - logarithmic standard deviation of within event residuals; tau - logarithmic standard deviation of between event residuals; period - the corresponding oscillator periods

References

Abrahamson, N. A., Silva, W. J., and Kamai, R. (2014). Summary of the ASK14 Ground Motion Relation for Active Crustal Regions. Earthquake Spectra, 30(3), 1025-1055.

Examples

ask_2014_nga(M = 5, T = 1000, Rrup = 90, Rjb = 85, Rx = 85, Ry0 = 80, dip = 80,
lambda = 75, after_shock = 0, HW = 1, W = 10, region = 1, Vs30 = 350, Vs30_code = 0)

wltcwpf/GMPE documentation built on July 27, 2024, 4:28 p.m.