# http://pyrocko.org - GPLv3
#
# The Pyrocko Developers, 21st Century
# ---|P------/S----------~Lg----------
'''
Pseudo dynamic rupture random source generator.
'''
import numpy as num
from pyrocko.guts import Float, Int
from pyrocko import gf
from .base import SourceGenerator
km = 1e3
guts_prefix = 'pf.scenario'
[docs]class PseudoDynamicRuptureGenerator(SourceGenerator):
depth_min = Float.T(
default=0.0)
depth_max = Float.T(
default=5*km)
decimation_factor = Int.T(
default=1)
slip_min = Float.T(
optional=True)
slip_max = Float.T(
optional=True)
strike = Float.T(
optional=True)
dip = Float.T(
optional=True)
rake = Float.T(
optional=True)
depth = Float.T(
optional=True)
nx = Int.T(
default=5,
optional=True)
ny = Int.T(
default=5,
optional=True)
nucleation_x = Float.T(
optional=True)
nucleation_y = Float.T(
optional=True)
width = Float.T(
optional=True)
length = Float.T(
optional=True)
gamma = Float.T(
default=0.8)
def draw_slip(self, rstate):
if self.slip_min is not None and self.slip_max is not None:
return rstate.uniform(self.slip_min, self.slip_max)
else:
return rstate.rand()
def get_source(self, ievent):
rstate = self.get_rstate(ievent)
time = rstate.uniform(self.time_min, self.time_max)
lat, lon = self.get_latlon(ievent)
depth = rstate.uniform(self.depth_min, self.depth_max)
nucleation_x = self.nucleation_x if self.nucleation_x is not None \
else rstate.uniform(-1., 1.)
nucleation_y = self.nucleation_y if self.nucleation_y is not None \
else rstate.uniform(-1., 1.)
def scale_from_slip(slip, a, b):
return 10**((num.log10(slip) - a) / b)
if self.slip_min is not None and self.slip_max is not None:
slip = self.draw_slip(rstate)
# After K. Thingbaijam et al. (2017) - Tab. 2, Normal faulting
length = scale_from_slip(slip, a=-2.302, b=1.302)
width = scale_from_slip(slip, a=-3.698, b=2.512)
else:
slip = self.draw_slip(rstate)
length = scale_from_slip(slip, a=-2.302, b=1.302)
width = scale_from_slip(slip, a=-3.698, b=2.512)
length = length if not self.length else self.length
width = width if not self.width else self.width
depth = depth if not self.depth else self.depth
if self.strike is None and self.dip is None and self.rake is None:
strike, rake = rstate.uniform(-180., 180., 2)
dip = rstate.uniform(0., 90.)
else:
if None in (self.strike, self.dip, self.rake):
raise ValueError(
'PseudoDynamicRuptureGenerator: '
'strike, dip, rake must be used in combination.')
strike = self.strike
dip = self.dip
rake = self.rake
source = gf.PseudoDynamicRupture(
time=float(time),
lat=float(lat),
lon=float(lon),
anchor='top',
depth=float(depth),
length=float(length),
width=float(width),
strike=float(strike),
dip=float(dip),
rake=float(rake),
slip=slip,
nucleation_x=float(nucleation_x),
nucleation_y=float(nucleation_y),
nx=self.nx,
ny=self.ny,
decimation_factor=self.decimation_factor,
smooth_rupture=True,
gamma=self.gamma)
return source
def add_map_artists(self, automap):
for source in self.get_sources():
automap.gmt.psxy(
in_rows=source.outline(cs='lonlat'),
L='+p2p,black',
W='1p,black',
G='black',
t=50,
*automap.jxyr)
