gf_forward_pseudo_rupture_complex.py

import os.path as op

from pyrocko import gf
from pyrocko.plot.dynamic_rupture import RuptureView

km = 1e3

# The store we are going extract data from:
store_id = 'iceland_reg_v2'

# First, download a Green's functions store. If you already have one that you
# would like to use, you can skip this step and point the *store_superdirs* to
# the containing directory.
if not op.exists(store_id):
    gf.ws.download_gf_store(site='kinherd', store_id=store_id)

# We need a pyrocko.gf.Engine object which provides us with the traces
# extracted from the store. In this case we are going to use a local
# engine since we are going to query a local store.
engine = gf.LocalEngine(store_superdirs=['.'])

# The dynamic parameters used for discretization of the PseudoDynamicRupture
# are extracted from the store's config file.
store = engine.get_store(store_id)

# Let's define the source now with its extension, orientation etc.
rupture = gf.PseudoDynamicRupture(
    lat=0.,
    lon=0.,
    north_shift=2.*km,
    east_shift=2.*km,
    depth=3.*km,
    strike=43.,
    dip=89.,

    length=15*km,
    width=5*km,

    nx=10,
    ny=5,

    # Relative nucleation between -1. and 1.
    nucleation_x=-.6,
    nucleation_y=.3,

    # Relation between subsurface model s-wave velocity vs
    # and rupture velocity vr
    gamma=0.7,

    slip=1.,
    anchor='top',

    # Threads used for modelling
    nthreads=1,

    # Force pure shear rupture
    pure_shear=True,

    # Tractions are in [Pa]. However here we are using relative tractions,
    # Resulting waveforms will be scaled to the maximumslip [m]
    tractions=gf.tractions.TractionComposition(
        components=[
            gf.tractions.DirectedTractions(rake=56., traction=1.e6),
            gf.tractions.FractalTractions(rake=56., traction_max=.4e6),
            gf.tractions.RectangularTaper()
        ])
)

rupture.discretize_patches(store)

# Plot the absolute tractions from strike, dip, normal
plot = RuptureView(rupture, figsize=(8, 4))
plot.draw_patch_parameter('traction')
plot.draw_nucleation_point()
plot.save('dynamic_complex_tractions.png')

# Plot the modelled dislocations
plot = RuptureView(rupture, figsize=(8, 4))
plot.draw_dislocation()
# We can also define a time for the snapshot:
# plot.draw_dislocation(time=1.5)
plot.draw_time_contour(store)
plot.draw_nucleation_point()
plot.save('dynamic_complex_dislocations.png')

# Forward model waveforms for one station
engine = gf.LocalEngine(store_superdirs=['.'])
store = engine.get_store(store_id)

waveform_target = gf.Target(
    lat=0.,
    lon=0.,
    east_shift=10*km,
    north_shift=30.*km,
    interpolation='multilinear',
    store_id=store_id)

response = engine.process(rupture, waveform_target)
response.snuffle()