def test_dpp_parameter_ss3case_site_b(self):
site_b = Point(10.639652, 45.333116, 0.)
self.pp = projection_pp(site_b, self.normal, self.dist_to_plane,
self.origin)
pd, e, idx_nxtp = directp(self.p0, self.p1, self.p2, self.p3,
self.hypocentre, self.origin, self.pp)
fs, rd, r_hyp = average_s_rad(site_b, self.hypocentre, self.origin,
self.pp, self.normal, self.dist_to_plane,
e, self.p0, self.p1, self.delta_slip)
c_prime = isochone_ratio(e, rd, r_hyp)
# The value used for this test is from the DPP author Dr. Chiou
# for the case, ss3, pure strike slip.
self.assertAlmostEqual(fs, 0.9982396, delta=0.1)
self.assertAlmostEqual(rd, 50., delta=0.1)
self.assertAlmostEqual(r_hyp, 50.99, delta=0.1)
self.assertAlmostEqual(e, 10., delta=0.1)
self.assertAlmostEqual(c_prime, 0.8688245, delta=0.1)
def test_dpp_parameter_ss3case_site_b(self):
site_b = Point(10.639652, 45.333116, 0.)
self.pp = projection_pp(site_b, self.normal, self.dist_to_plane,
self.origin)
pd, e, idx_nxtp = directp(self.p0, self.p1, self.p2, self.p3,
self.hypocentre, self.origin, self.pp)
fs, rd, r_hyp = average_s_rad(site_b, self.hypocentre, self.origin,
self.pp, self.normal, self.dist_to_plane,
e, self.p0, self.p1, self.delta_slip)
c_prime = isochone_ratio(e, rd, r_hyp)
# The value used for this test is from the DPP author Dr. Chiou
# for the case, ss3, pure strike slip.
self.assertAlmostEqual(fs, 0.9982396, delta=0.1)
self.assertAlmostEqual(rd, 50., delta=0.1)
self.assertAlmostEqual(r_hyp, 50.99, delta=0.1)
self.assertAlmostEqual(e, 10., delta=0.1)
self.assertAlmostEqual(c_prime, 0.8688245, delta=0.1)
def test_dpp_parameter_ss3case_site_a(self):
site_a = Point(10., 44.57, 0.)
self.pp = projection_pp(site_a, self.normal, self.dist_to_plane,
self.origin)
pd, e, idx_nxtp = directp(self.p0, self.p1, self.p2, self.p3,
self.hypocentre, self.origin, self.pp)
fs, rd, r_hyp = average_s_rad(site_a, self.hypocentre, self.origin,
self.pp, self.normal, self.dist_to_plane,
e, self.p0, self.p1, self.delta_slip)
c_prime = isochone_ratio(e, rd, r_hyp)
# The value used for this test is from the DPP author Dr. Chiou
# for the case, ss3, pure strike slip
self.assertAlmostEqual(fs, 0.9931506, delta=0.1)
self.assertAlmostEqual(rd, 70.4828, delta=0.1)
self.assertAlmostEqual(r_hyp, 85.5862, delta=0.1)
self.assertAlmostEqual(e, 15.1034495, delta=0.1)
self.assertAlmostEqual(idx_nxtp, 0., delta=0.1)
self.assertAlmostEqual(c_prime, 4., delta=0.1)
def test_dpp_parameter_ss3case_site_a(self):
site_a = Point(10., 44.57, 0.)
self.pp = projection_pp(site_a, self.normal, self.dist_to_plane,
self.origin)
pd, e, idx_nxtp = directp(self.p0, self.p1, self.p2, self.p3,
self.hypocentre, self.origin, self.pp)
fs, rd, r_hyp = average_s_rad(site_a, self.hypocentre, self.origin,
self.pp, self.normal, self.dist_to_plane,
e, self.p0, self.p1, self.delta_slip)
c_prime = isochone_ratio(e, rd, r_hyp)
# The value used for this test is from the DPP author Dr. Chiou
# for the case, ss3, pure strike slip
self.assertAlmostEqual(fs, 0.9931506, delta=0.1)
self.assertAlmostEqual(rd, 70.4828, delta=0.1)
self.assertAlmostEqual(r_hyp, 85.5862, delta=0.1)
self.assertAlmostEqual(e, 15.1034495, delta=0.1)
self.assertAlmostEqual(idx_nxtp, 0., delta=0.1)
self.assertAlmostEqual(c_prime, 4., delta=0.1)
def get_dppvalue(self, site):
"""
Get the directivity prediction value, DPP at
a given site as described in Spudich et al. (2013).
:param site:
:class:`~openquake.hazardlib.geo.point.Point` object
representing the location of the target site
:returns:
A float number, directivity prediction value (DPP).
"""
origin = self.surface.get_resampled_top_edge()[0]
dpp_multi = []
index_patch = self.surface.hypocentre_patch_index(
self.hypocenter, self.surface.get_resampled_top_edge(),
self.surface.mesh.depths[0][0], self.surface.mesh.depths[-1][0],
self.surface.get_dip())
idx_nxtp = True
hypocenter = self.hypocenter
while idx_nxtp:
# E Plane Calculation
p0, p1, p2, p3 = self.surface.get_fault_patch_vertices(
self.surface.get_resampled_top_edge(),
self.surface.mesh.depths[0][0],
self.surface.mesh.depths[-1][0],
self.surface.get_dip(),
index_patch=index_patch)
[normal, dist_to_plane] = get_plane_equation(p0, p1, p2, origin)
pp = projection_pp(site, normal, dist_to_plane, origin)
pd, e, idx_nxtp = directp(p0, p1, p2, p3, hypocenter, origin, pp)
pd_geo = origin.point_at((pd[0]**2 + pd[1]**2)**0.5, -pd[2],
numpy.degrees(math.atan2(pd[0], pd[1])))
# determine the lower bound of E path value
f1 = geodetic_distance(p0.longitude, p0.latitude, p1.longitude,
p1.latitude)
f2 = geodetic_distance(p2.longitude, p2.latitude, p3.longitude,
p3.latitude)
if f1 > f2:
f = f1
else:
f = f2
fs, rd, r_hyp = average_s_rad(site, hypocenter, origin, pp, normal,
dist_to_plane, e, p0, p1,
self.rupture_slip_direction)
cprime = isochone_ratio(e, rd, r_hyp)
dpp_exp = cprime * numpy.maximum(e, 0.1 * f) *\
numpy.maximum(fs, 0.2)
dpp_multi.append(dpp_exp)
# check if go through the next patch of the fault
index_patch = index_patch + 1
if (len(self.surface.get_resampled_top_edge()) <= 2) and (
index_patch >= len(self.surface.get_resampled_top_edge())):
idx_nxtp = False
elif index_patch >= len(self.surface.get_resampled_top_edge()):
idx_nxtp = False
elif idx_nxtp:
hypocenter = pd_geo
idx_nxtp = True
# calculate DPP value of the site.
dpp = numpy.log(numpy.sum(dpp_multi))
return dpp
def get_dppvalue(self, site):
"""
Get the directivity prediction value, DPP at
a given site as described in Spudich et al. (2013).
:param site:
:class:`~openquake.hazardlib.geo.point.Point` object
representing the location of the target site
:returns:
A float number, directivity prediction value (DPP).
"""
origin = self.surface.get_resampled_top_edge()[0]
dpp_multi = []
index_patch = self.surface.hypocentre_patch_index(
self.hypocenter, self.surface.get_resampled_top_edge(),
self.surface.mesh.depths[0][0], self.surface.mesh.depths[-1][0],
self.surface.get_dip())
idx_nxtp = True
hypocenter = self.hypocenter
while idx_nxtp:
# E Plane Calculation
p0, p1, p2, p3 = self.surface.get_fault_patch_vertices(
self.surface.get_resampled_top_edge(),
self.surface.mesh.depths[0][0],
self.surface.mesh.depths[-1][0],
self.surface.get_dip(), index_patch=index_patch)
[normal, dist_to_plane] = get_plane_equation(
p0, p1, p2, origin)
pp = projection_pp(site, normal, dist_to_plane, origin)
pd, e, idx_nxtp = directp(
p0, p1, p2, p3, hypocenter, origin, pp)
pd_geo = origin.point_at(
(pd[0] ** 2 + pd[1] ** 2) ** 0.5, -pd[2],
numpy.degrees(math.atan2(pd[0], pd[1])))
# determine the lower bound of E path value
f1 = geodetic_distance(p0.longitude,
p0.latitude,
p1.longitude,
p1.latitude)
f2 = geodetic_distance(p2.longitude,
p2.latitude,
p3.longitude,
p3.latitude)
if f1 > f2:
f = f1
else:
f = f2
fs, rd, r_hyp = average_s_rad(site, hypocenter, origin,
pp, normal, dist_to_plane, e, p0,
p1, self.rupture_slip_direction)
cprime = isochone_ratio(e, rd, r_hyp)
dpp_exp = cprime * numpy.maximum(e, 0.1 * f) *\
numpy.maximum(fs, 0.2)
dpp_multi.append(dpp_exp)
# check if go through the next patch of the fault
index_patch = index_patch + 1
if (len(self.surface.get_resampled_top_edge())
<= 2) and (index_patch >=
len(self.surface.get_resampled_top_edge())):
idx_nxtp = False
elif index_patch >= len(self.surface.get_resampled_top_edge()):
idx_nxtp = False
elif idx_nxtp:
hypocenter = pd_geo
idx_nxtp = True
# calculate DPP value of the site.
dpp = numpy.log(numpy.sum(dpp_multi))
return dpp
