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342 lines
12 KiB
342 lines
12 KiB
from __future__ import print_function
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from builtins import str
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import os
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import copy
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import numpy as num
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from collections import defaultdict
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from pyrocko.gui.snuffling import Snuffling, Param, PhaseMarker, Switch, Choice, \
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EventMarker
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from pyrocko import guts, orthodrome, trace
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from pyrocko.gui.util import to01
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from pyrocko.plot import graph_colors
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__author__ = 'Catarina Matos (cpfcmatos@gmail.com)'
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km = 1000.
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wood_anderson_response = trace.PoleZeroResponse(
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zeros=[0., 0.],
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poles=[(-5.49779 - 5.60886j), (-5.49779 + 5.60886j)],
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constant=1.
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)
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class LocalMagnitudeSnuffling(Snuffling):
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'''
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Local Magnitude Estimation
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--------------------------
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Main Control High- and Lowpass filters are applied to the data before
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simulating the Wood-Anderson receiver.
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The suggested default values for the geometrical spreading, anelastic
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attenuation and static magnification are those recommended by IASPEI.
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For correct estimates these values have to be calibrated for the region
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under investigation.
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For further information:
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http://gfzpublic.gfz-potsdam.de/pubman/item/escidoc:816929:1/component/escidoc:816928/IS_3.3_rev1.pdf
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Waveform data either need to have unit 'meters' or if instument
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responses have to be removed select *Needs restitution* and use the file
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browser to read responses.
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References:
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- Bormann, P. and Dewey J., 2012. The new IASPEI standards for determining
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magnitudes from digital data and their relation to classical
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magnitudes. doi:
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- Hutton, K.L. and Boore D.M., 1987. The ML scale in southern California.
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Bull. seism. Soc. Am., 77, 2074-2094
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- Richter C.F., 1935. An instrumental earthquake magnitude scale, Bull.
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seism. Soc. Am., 25, 1-32.
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'''
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def setup(self):
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self._responses = None
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self.add_parameter(Param(
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'geom. spreading', 'const_a', 1.11, 1., 2.))
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self.add_parameter(Param(
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'anelastic attenuation', 'const_b', 0.00189, 0., 1.))
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self.add_parameter(Param(
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'static magnification', 'const_c', -2.09, -5., 5.))
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self.add_parameter(Param(
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'Duration for "fixed" time window',
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'duration_fixed', 200., 1., 500.))
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self.add_parameter(Choice(
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'Time window', 'time_window', 'visible / selected',
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['visible / selected', 'fixed', 'distance dependent']))
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self.add_parameter(Choice(
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'Apply to', 'apply_to', 'active event',
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['active event', 'selected events', 'all events']))
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self.add_parameter(Switch(
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'Show restituted traces', 'show_restituded_traces', False))
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self.add_parameter(Switch(
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'Mark readings', 'show_markers', False))
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self.add_parameter(Switch(
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'Show plot', 'show_plot', False))
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self.add_parameter(Switch(
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'Show message', 'do_show_message', True))
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self.add_parameter(Switch(
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'Needs restitution', 'needs_restitution', False))
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self.add_parameter(Switch(
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'Set event magnitude', 'modify_inplace', False))
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self.set_name('Local Magnitude')
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self.set_live_update(False)
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self.vmin = 1500.
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self.vmax = 6000.
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def read_responses(self, dirname):
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responses = {}
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entries = os.listdir(dirname)
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for entry in entries:
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if entry.endswith('.pf'):
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key = tuple(entry[:-3].split('.'))
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fn = os.path.join(dirname, entry)
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resp = guts.load(filename=fn)
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responses[key] = resp
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return responses
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def local_magnitude(self, distance, amplitude):
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return num.log10(amplitude*1.0e9) + \
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self.const_a*num.log10(distance/km) + \
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self.const_b*distance/km + self.const_c
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def get_response(self, nslc):
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if self._responses is None:
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self._responses = self.read_responses(self.input_directory())
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n, s, l, c = nslc
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for k in [(n, s, l, c), (n, s, c), (s, c), (s,)]:
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if k in self._responses:
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return self._responses[k]
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self.fail(
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'no response information available for trace %s.%s.%s.%s' % nslc)
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def get_traces(self, event, stations, trace_selector, tpad):
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p = self.get_pile()
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trace_selector_viewer = self.get_viewer_trace_selector('visible')
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if self.time_window == 'distance dependant':
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for station in stations:
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distance = orthodrome.distance_accurate50m(event, station)
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tmin = distance / self.vmax
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tmax = (distance + event.depth) / self.vmin
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for trs in p.chopper(
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tmin=event.time + tmin,
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tmax=event.time + tmax,
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tpad=tpad,
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trace_selector=lambda tr: (
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trace_selector(tr) and
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trace_selector_viewer(tr) and
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tr.nslc_id[:3] == station.nsl())):
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for tr in trs:
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yield tr
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elif self.time_window == 'fixed':
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tmin = 0.
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tmax = self.duration_fixed
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for trs in p.chopper(
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tmin=event.time + tmin,
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tmax=event.time + tmax,
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tpad=tpad,
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trace_selector=lambda tr: (
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trace_selector(tr) and
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trace_selector_viewer(tr))):
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for tr in trs:
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yield tr
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else:
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for trs in self.chopper_selected_traces(
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fallback=True, tpad=tpad,
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trace_selector=trace_selector, mode='inview'):
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for tr in trs:
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yield tr
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def call(self):
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self.cleanup()
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if self.apply_to == 'active event':
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event, _ = self.get_active_event_and_stations()
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events = [event]
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elif self.apply_to == 'selected events':
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events = [m.get_event() for m in self.get_selected_event_markers()]
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elif self.apply_to == 'all events':
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events = []
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for m in self.get_markers():
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if isinstance(m, EventMarker):
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events.append(m.get_event())
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events.sort(key=lambda ev: ev.time)
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if not events:
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self.fail('no event selected')
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if self.time_window == 'visible / selected' and len(events) != 1:
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self.fail('cannot work with multiple events with "visible / '
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'selected" time window setting')
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stations_dict = dict((s.nsl(), s) for s in self.get_stations())
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if len(stations_dict) == 0:
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self.fail('no station information found')
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markers = []
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local_magnitudes = []
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viewer = self.get_viewer()
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fmin = viewer.highpass
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fmax = viewer.lowpass
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if not fmin or not fmax:
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self.fail('Main Controls Highpass and Lowpass filters have to be set') # noqa
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for event in events:
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mags = defaultdict(list)
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tpad = 2./fmin
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def trace_selector(tr):
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c = tr.channel.upper()
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return c.endswith('E') or c.endswith('N') or \
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tr.location.endswith('_rest')
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distances = {}
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rest_traces = []
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event2 = copy.deepcopy(event)
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for tr in self.get_traces(
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event, stations_dict.values(), trace_selector, tpad):
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nslc = tr.nslc_id
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try:
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tr.highpass(4, fmin, nyquist_exception=True)
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tr.lowpass(4, fmax, nyquist_exception=True)
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except trace.AboveNyquist as e:
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self.fail(str(e))
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try:
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station = stations_dict[nslc[:3]]
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except KeyError as e:
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print(e)
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continue
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if self.needs_restitution:
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resp = self.get_response(nslc)
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try:
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tr_vel = tr.transfer(
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tfade=tpad,
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freqlimits=(
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fmin*0.5, fmin,
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fmax, fmax*2.0),
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transfer_function=resp,
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invert=True)
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except trace.TraceTooShort as e:
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self.fail(str(e))
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continue
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else:
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try:
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tr_vel = tr.transfer(
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tfade=tpad,
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freqlimits=(
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fmin*0.5, fmin,
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fmax, fmax*2.0),
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transfer_function=wood_anderson_response,
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invert=False)
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except trace.TraceTooShort as e:
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self.fail(str(e))
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continue
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distance = orthodrome.distance_accurate50m(event, station)
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tr_vel.set_codes(location=tr_vel.location+'_rest')
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tr_vel.meta = dict(tabu=True)
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t_of_max, amplitude = tr_vel.absmax()
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if self.show_restituded_traces:
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rest_traces.append(tr_vel)
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m_nslc = tr_vel.nslc_id
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else:
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m_nslc = tr.nslc_id
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mag = self.local_magnitude(distance, amplitude)
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if self.show_markers:
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markers.append(PhaseMarker(
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[m_nslc],
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t_of_max, t_of_max, 1, phasename='%3.1f' % mag,
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event=event2))
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mags[nslc[:2]].append(mag)
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distances[nslc[:2]] = distance
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if not mags:
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continue
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if rest_traces:
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self.add_traces(rest_traces)
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for k in mags:
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mags[k] = max(mags[k])
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local_magnitude = round(num.median(list(mags.values())), 1)
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if self.show_plot:
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data = []
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for k in mags:
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data.append((distances[k], mags[k]))
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dists, mags_arr = num.array(data).T
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dists /= km
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fig = self.figure()
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axes = fig.add_subplot(1, 1, 1)
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axes.plot(dists, mags_arr, 'o', color=to01(graph_colors[0]))
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for x, y, label in zip(dists, mags_arr, mags.keys()):
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axes.text(x, y, '.'.join(label))
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axes.axhline(local_magnitude, color=to01(graph_colors[0]))
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mag_std = num.std(list(mags.values()))
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msg = 'local magnitude: %s, std: %s' % \
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(round(local_magnitude, 1),
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round(mag_std, 1))
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axes.text(max(dists), local_magnitude, msg,
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verticalalignment='bottom',
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horizontalalignment='right')
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axes.axhspan(
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local_magnitude-mag_std,
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local_magnitude+mag_std,
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alpha=0.1)
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axes.set_xlabel('Distance [km]')
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axes.set_ylabel('Local Magnitude')
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fig.canvas.draw()
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local_magnitudes.append(local_magnitude)
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if self.modify_inplace:
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event.magnitude = local_magnitude
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if markers:
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self.add_markers(markers)
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if not local_magnitudes:
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self.fail('no results')
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if self.do_show_message:
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self.show_message('Magnitude', ', '.join(
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'%3.1f' % mag for mag in local_magnitudes))
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def __snufflings__():
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return [LocalMagnitudeSnuffling()]
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