From 30970b8451408985aeff03c57f464c04832eb882 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Ludger=20K=C3=BCperkoch?= Date: Tue, 1 Dec 2015 15:41:37 +0100 Subject: [PATCH] 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. --- pylot/core/analysis/magnitude.py | 117 +++++++++++++++++++++---------- 1 file changed, 81 insertions(+), 36 deletions(-) diff --git a/pylot/core/analysis/magnitude.py b/pylot/core/analysis/magnitude.py index ff1f580e..074eebe9 100644 --- a/pylot/core/analysis/magnitude.py +++ b/pylot/core/analysis/magnitude.py @@ -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):