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Modified class MoMw: new functio run_calcMoMw using subfunction calcMoMw, gets hypocentral distances from NLLoc-location file. Returns modified pick dictionary including individual seismic moments and corresponding moment magnitudes.

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This commit is contained in:
Ludger Küperkoch 2015-12-01 15:41:37 +01:00
parent c3d7581f94
commit 30970b8451
1 changed files with 81 additions and 36 deletions
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117
pylot/core/analysis/magnitude.py
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@ -10,15 +10,17 @@ import matplotlib.pyplot as plt
import numpy as np
from obspy.core import Stream
from pylot.core.pick.utils import getsignalwin
from pylot.core.util.utils import getPatternLine
from scipy.optimize import curve_fit
class Magnitude(object):
'''
Superclass for calculating Wood-Anderson peak-to-peak
amplitudes, local magnitudes and moment magnitudes.
amplitudes, local magnitudes, seismic moments
and moment magnitudes.
'''
def __init__(self, wfstream, To, pwin, iplot, w0=None, delta=None, rho=None, vp=None):
def __init__(self, wfstream, To, pwin, iplot, NLLocfile=None, picks=None, rho=None, vp=None):
'''
:param: wfstream
:type: `~obspy.core.stream.Stream
@ -32,8 +34,20 @@ class Magnitude(object):
:type: float
:param: iplot, no. of figure window for plotting interims results
:type: integer
:type: integer
:param: NLLocfile, name and full path to NLLoc-location file
needed when calling class MoMw
:type: string
:param: picks, dictionary containing picking results
:type: dictionary
:param: rho [kg/m³], rock density, parameter from autoPyLoT.in
:type: integer
:param: vp [m/s], P-velocity
:param: integer
'''
assert isinstance(wfstream, Stream), "%s is not a stream object" % str(wfstream)
@ -42,13 +56,13 @@ class Magnitude(object):
self.setTo(To)
self.setpwin(pwin)
self.setiplot(iplot)
self.setw0(w0)
self.setNLLocfile(NLLocfile)
self.setrho(rho)
self.setdelta(delta)
self.setpicks(picks)
self.setvp(vp)
self.calcwapp()
self.calcsourcespec()
self.calcMoMw()
self.run_calcMoMw()
def getwfstream(self):
@ -75,11 +89,11 @@ class Magnitude(object):
def setiplot(self, iplot):
self.iplot = iplot
def setw0(self, w0):
self.w0 = w0
def setNLLocfile(self, NLLocfile):
self.NLLocfile = NLLocfile
def getw0(self):
return self.w0
def getNLLocfile(self):
return self.NLLocfile
def setrho(self, rho):
self.rho = rho
@ -93,11 +107,11 @@ class Magnitude(object):
def getvp(self):
return self.vp
def setdelta(self, delta):
self.delta = delta
def setpicks(self, picks):
self.picks = picks
def getdelta(self):
return self.delta
def getpicks(self):
return self.picks
def getwapp(self):
return self.wapp
@ -108,11 +122,8 @@ class Magnitude(object):
def getfc(self):
return self.fc
def getMo(self):
return self.Mo
def getMw(self):
return self.Mw
def getpicdic(self):
return self.picdic
def calcwapp(self):
self.wapp = None
@ -120,9 +131,8 @@ class Magnitude(object):
def calcsourcespec(self):
self.sourcespek = None
def calcMoMw(self):
self.Mo = None
self.Mw = None
def run_calcMoMw(self):
self.pickdic = None
class WApp(Magnitude):
'''
@ -177,27 +187,62 @@ class WApp(Magnitude):
class M0Mw(Magnitude):
'''
Method to calculate seismic moment Mo and moment magnitude Mw.
Uses class w0fc for calculating plateau wo and corner frequency
fc of source spectrum, respectively.
Requires results of class w0fc for calculating plateau w0
and corner frequency fc of source spectrum, respectively. Uses
subfunction calcMoMw.py. Returns modified dictionary of picks including
seismic moment Mo and corresponding moment magntiude Mw.
'''
def calcMoMw(self):
def run_calcMoMw(self):
stream = self.getwfstream()
tr = stream[0]
picks = self.getpicks()
nllocfile = self.getNLLocfile()
wfdat = self.getwfstream()
for key in picks:
if picks[key]['P']['weight'] < 4 and picks[key]['P']['w0'] is not None:
# select waveform
selwf = wfdat.select(station=key)
# get corresponding height of source spectrum plateau w0
w0 = picks[key]['P']['w0']
# get hypocentral distance of station
# from NLLoc-location file
if len(key) > 4:
Ppattern = '%s ? ? ? P' % key
elif len(key) == 4:
Ppattern = '%s ? ? ? P' % key
elif len(key) < 4:
Ppattern = '%s ? ? ? P' % key
nllocline = getPatternLine(nllocfile, Ppattern)
delta = float(nllocline.split(None)[21])
# call subfunction
[Mo, Mw] = calcMoMw(selwf, w0, self.getrho(), self.getvp(), delta)
# add Mo and Mw to dictionary
picks[key]['P']['Mo'] = Mo
picks[key]['P']['Mw'] = Mw
self.picdic = picks
print("Calculating seismic moment Mo and moment magnitude Mw for station %s ..." \
% tr.stats.station)
def calcMoMw(wfstream, w0, rho, vp, delta):
'''
Subfunction of run_calcMoMw to calculate individual
seismic moments and corresponding moment magnitudes.
'''
# additional common parameters for calculating Mo
rP = 2 / np.sqrt(15) # average radiation pattern of P waves (Aki & Richards, 1980)
freesurf = 2.0 # free surface correction, assuming vertical incidence
tr = wfstream[0]
self.Mo = (self.getw0() * 4 * np.pi * self.getrho() * np.power(self.getvp(), 3) * \
self.getdelta()) / (rP * freesurf)
print("calcMoMw: Calculating seismic moment Mo and moment magnitude Mw for station %s ..." \
% tr.stats.station)
self.Mw = 2/3 * np.log10(self.Mo) - 6
print("MoMw: Calculated seismic moment Mo = %e Nm => Mw = %3.1f " % (self.Mo, self.Mw))
# additional common parameters for calculating Mo
rP = 2 / np.sqrt(15) # average radiation pattern of P waves (Aki & Richards, 1980)
freesurf = 2.0 # free surface correction, assuming vertical incidence
Mo = w0 * 4 * np.pi * rho * np.power(vp, 3) * delta / (rP * freesurf)
Mw = np.log10(Mo * 1e07) * 2 / 3 - 10.7 #after Hanks & Kanamori (1979), defined for [dyn*cm]!
print("calcMoMw: Calculated seismic moment Mo = %e Nm => Mw = %3.1f " % (Mo, Mw))
return Mo, Mw
class w0fc(Magnitude):