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test_seismic_phase.py
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test_seismic_phase.py
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
Tests the SeismicPhase class.
"""
from pathlib import Path
import pytest
from obspy.core.util.misc import TemporaryWorkingDirectory
from obspy.taup import TauPyModel
from obspy.taup.tau_model import TauModel
from obspy.taup.seismic_phase import SeismicPhase
from obspy.taup.taup_create import build_taup_model
from obspy.taup.helper_classes import TauModelError
class TestTauPySeismicPhase:
"""
Test suite for the SeismicPhase class.
"""
depth = 119
@pytest.fixture(scope='class')
def tau_model(self):
"""Return the tau model for testing."""
return TauModel.from_file('iasp91').depth_correct(self.depth)
def test_shoot_existing_ray_param(self, tau_model):
self.do_shoot_existing_ray_param_for_phase('P', tau_model)
self.do_shoot_existing_ray_param_for_phase('S', tau_model)
self.do_shoot_existing_ray_param_for_phase('p', tau_model)
self.do_shoot_existing_ray_param_for_phase('p', tau_model)
self.do_shoot_existing_ray_param_for_phase('s', tau_model)
self.do_shoot_existing_ray_param_for_phase('PP', tau_model)
self.do_shoot_existing_ray_param_for_phase('SS', tau_model)
self.do_shoot_existing_ray_param_for_phase('PcP', tau_model)
self.do_shoot_existing_ray_param_for_phase('ScS', tau_model)
self.do_shoot_existing_ray_param_for_phase('PKP', tau_model)
self.do_shoot_existing_ray_param_for_phase('SKS', tau_model)
self.do_shoot_existing_ray_param_for_phase('PKIKP', tau_model)
self.do_shoot_existing_ray_param_for_phase('SKIKS', tau_model)
def do_shoot_existing_ray_param_for_phase(self, phase_name, tau_model):
phase = SeismicPhase(phase_name, tau_model)
for i, ray_param in enumerate(phase.ray_param):
max_rp_arrival = phase.shoot_ray(-1, ray_param)
assert abs(phase.dist[i]-max_rp_arrival.purist_dist) < 0.0001
assert abs(phase.time[i]-max_rp_arrival.time) < 0.0001
def test_shoot_middle_ray_param(self, tau_model):
phase = SeismicPhase('P', tau_model)
for i in range(phase.ray_param.shape[0] - 1):
rp = (phase.ray_param[i] + phase.ray_param[i + 1]) / 2
time_tol = abs(phase.time[i] - phase.time[i + 1])
max_rp_arrival = phase.shoot_ray(-1, rp)
assert abs(phase.dist[i]-max_rp_arrival.purist_dist) < 0.1
assert abs(phase.time[i]-max_rp_arrival.time) < time_tol
assert abs(phase.dist[i + 1]-max_rp_arrival.purist_dist) < 0.1
assert abs(phase.time[i + 1]-max_rp_arrival.time) < time_tol
def test_many_identically_named_phases(self, testdata):
"""
Regression test to make sure obspy.taup works with models that
produce many identically names seismic phases.
"""
with TemporaryWorkingDirectory():
folder = Path()
model_name = "smooth_geodynamic_model"
build_taup_model(
filename=testdata[model_name + ".tvel"],
output_folder=folder, verbose=False)
m = TauPyModel(str(folder / (model_name + ".npz")))
arr = m.get_ray_paths(172.8000, 46.762440693494824, ["SS"])
assert len(arr) > 10
def test_diffracted_phases(self):
"""
Test of exotic diffracted phases.
"""
model = TauPyModel('iasp91')
phs = ["SedPdiffKP", "PdiffPdiff", "PedPdiffKKP",
"PdiffKKPdiff", "PPdiff", "SKdiffP"]
dists = [155.0, 210.0, 310.0, 300.0, 220.0, 200.0]
times = [1464.97, 1697.88, 2052.42, 2008.03, 1742.27, 1431.53]
for ph, dist, time in zip(phs, dists, times):
phase = SeismicPhase(ph, model.model)
arrivals = phase.calc_time(dist)
arrival = arrivals[0]
phase.calc_pierce_from_arrival(arrival)
phase.calc_path_from_arrival(arrival)
tol = 1e-2
assert abs(arrival.time - time) < tol
assert abs(arrival.pierce["time"][-1] - time) < tol
assert abs(arrival.path["time"][-1] - time) < tol
def test_phase_names(self, tau_model):
"""
Simple check to see if illegal phase names are caught.
"""
legal_phase_names = ["ScS", "ScSScS"]
illegal_phase_names = ["ScScS", "PKIKPKIKP", "PKIKIKP"]
for name in legal_phase_names:
SeismicPhase(name, tau_model)
for name in illegal_phase_names:
with pytest.raises(TauModelError):
SeismicPhase(name, tau_model)