Source code for obspy.taup.taup_time

# -*- coding: utf-8 -*-
"""
Travel time calculations.
"""
from .helper_classes import TauModelError
from .seismic_phase import SeismicPhase
from .utils import parse_phase_list


[docs]class TauPTime(object): """ Calculate travel times for different branches using linear interpolation between known slowness samples. """
[docs] def __init__(self, model, phase_list, depth, degrees, receiver_depth=0.0): self.source_depth = depth self.receiver_depth = receiver_depth self.degrees = degrees self.arrivals = [] self.phases = [] # Names of phases to be used, e.g. PKIKP self.phase_names = parse_phase_list(phase_list) # A standard and a depth corrected model. Both are needed. self.model = model self.depth_corrected_model = self.model
[docs] def run(self): """ Do all the calculations and print the output if told to. The resulting arrival times will be in self.arrivals. """ self.depth_correct(self.source_depth, self.receiver_depth) self.calculate(self.degrees)
[docs] def depth_correct(self, depth, receiver_depth=None): """ Corrects the TauModel for the given source depth (if not already corrected). """ if receiver_depth is None: receiver_depth = self.receiver_depth if self.depth_corrected_model is None or \ self.depth_corrected_model.source_depth != depth: self.depth_corrected_model = self.model.depth_correct(depth) self.arrivals = [] if receiver_depth != depth: # If already split on receiver depth this does nothing. self.depth_corrected_model = \ self.depth_corrected_model.split_branch(receiver_depth) self.arrivals = [] self.source_depth = depth self.receiver_depth = receiver_depth
[docs] def recalc_phases(self): """ Recalculates the given phases using a possibly new or changed tau model. """ new_phases = [] for temp_phase_name in self.phase_names: for phase_num, seismic_phase in enumerate(self.phases): pass # if seismic_phase.name == temp_phase_name: # self.phases.pop(phase_num) # if (seismic_phase.source_depth == self.source_depth and # seismic_phase.tau_model == # self.depth_corrected_model): # # OK so copy to new_phases: # new_phases.append(seismic_phase) # break # Executed, if break is NOT called. else: # Didn't find it precomputed, so recalculate: try: seismic_phase = SeismicPhase(temp_phase_name, self.depth_corrected_model, self.receiver_depth) new_phases.append(seismic_phase) except TauModelError: print("Error with this phase, skipping it: " + str(temp_phase_name)) self.phases = new_phases
[docs] def calculate(self, degrees): """ Calculate the arrival times. """ self.depth_correct(self.source_depth, self.receiver_depth) # Called before, but depth_correct might have changed the phases. self.recalc_phases() self.calc_time(degrees)
[docs] def calc_time(self, degrees): """ Calls the calc_time method of SeismicPhase to calculate arrival times for every phase, each sorted by time. """ self.degrees = degrees self.arrivals = [] for phase in self.phases: self.arrivals += phase.calc_time(degrees) # Sort them. self.arrivals = sorted(self.arrivals, key=lambda arrivals: arrivals.time)