Source code for pyrocko.scenario.sources.rectangularsource

# http://pyrocko.org - GPLv3
#
# The Pyrocko Developers, 21st Century
# ---|P------/S----------~Lg----------

'''
Rectangular fault random source generator.
'''

import numpy as num

from pyrocko.guts import Float, Int
from pyrocko import moment_tensor, gf, util

from .base import SourceGenerator

km = 1e3
guts_prefix = 'pf.scenario'


class RectangularSourceGenerator(SourceGenerator):
    depth_min = Float.T(
        default=0.0)
    depth_max = Float.T(
        default=5*km)
    decimation_factor = Int.T(
        default=4)

    strike = Float.T(
        optional=True)
    dip = Float.T(
        optional=True)
    rake = Float.T(
        optional=True)
    depth = Float.T(
        optional=True)

    width = Float.T(
        optional=True)
    length = Float.T(
        optional=True)

    def get_source(self, ievent):
        rstate = self.get_rstate(ievent)
        time = self.time_min + rstate.uniform(
            0., float(self.time_max - self.time_min))  # hptime aware
        lat, lon = self.get_latlon(ievent)
        depth = rstate.uniform(self.depth_min, self.depth_max)

        magnitude = self.draw_magnitude(rstate)
        moment = moment_tensor.magnitude_to_moment(magnitude)

        # After Mai and Beroza (2000)
        length = num.exp(-6.27 + 0.4*num.log(moment))
        width = num.exp(-4.24 + 0.32*num.log(moment))

        length = length if not self.length else self.length
        width = width if not self.width else self.width
        depth = depth if not self.depth else self.depth

        if self.strike is None and self.dip is None and self.rake is None:
            strike, rake = rstate.uniform(-180., 180., 2)
            dip = rstate.uniform(0., 90.)
        else:
            if None in (self.strike, self.dip, self.rake):
                raise ValueError(
                    'RectangularSourceGenerator: '
                    'strike, dip, rake must be used in combination.')

            strike = self.strike
            dip = self.dip
            rake = self.rake

        source = gf.RectangularSource(
            time=util.to_time_float(time),
            lat=float(lat),
            lon=float(lon),
            anchor='top',
            depth=float(depth),
            length=float(length),
            width=float(width),
            strike=float(strike),
            dip=float(dip),
            rake=float(rake),
            magnitude=magnitude,
            decimation_factor=self.decimation_factor)

        return source

    def add_map_artists(self, automap):
        for source in self.get_sources():
            automap.gmt.psxy(
                in_rows=source.outline(cs='lonlat'),
                L='+p2p,black',
                W='1p,black',
                G='black',
                t=50,
                *automap.jxyr)