Hazard curves calculation in openquake.hazardlib

LICENSE Copyright (c) 2014, GEM Foundation, G. Weatherill, M. Pagani, D. Monelli. The notebook is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. You should have received a copy of the GNU Affero General Public License along with OpenQuake. If not, see DISCLAIMER The notebook provided herein is released as a prototype implementation on behalf of scientists and engineers working within the GEM Foundation (Global Earthquake Model). It is distributed for the purpose of open collaboration and in the hope that it will be useful to the scientific, engineering, disaster risk and software design communities. The software is NOT distributed as part of GEM's OpenQuake suite (http://www.globalquakemodel.org/openquake) and must be considered as a separate entity. The software provided herein is designed and implemented by scientific staff. It is not developed to the design standards, nor subject to same level of critical review by professional software developers, as GEM's OpenQuake software suite. Feedback and contribution to the software is welcome, and can be directed to the hazard scientific staff of the GEM Model Facility (hazard@globalquakemodel.org). The notebook is therefore distributed WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. The GEM Foundation, and the authors of the software, assume no liability for use of the software.



In [1]:

    
%load_ext autoreload
%autoreload 2
import warnings; warnings.filterwarnings("ignore")



In [2]:

    
%matplotlib inline

from openquake.hazardlib.source import AreaSource
from openquake.hazardlib.mfd import TruncatedGRMFD
from openquake.hazardlib.scalerel import PointMSR, WC1994
from openquake.hazardlib.geo import Point, NodalPlane, Polygon
from openquake.hazardlib.pmf import PMF
from openquake.hazardlib.tom import PoissonTOM
from openquake.hazardlib.calc.hazard_curve import calc_hazard_curves
from openquake.hazardlib.site import Site, SiteCollection
from openquake.hazardlib.imt import PGA, SA
from openquake.hazardlib.gsim.campbell_bozorgnia_2008 import CampbellBozorgnia2008

import numpy
from matplotlib import pyplot

Hazard curves from area sources with point and finite ruptures



In [3]:

    
# define area source with point ruptures
src1 = AreaSource(
    source_id='1',
    name='area',
    tectonic_region_type='Active Shallow Crust',
    mfd=TruncatedGRMFD(min_mag=5., max_mag=6.5, bin_width=0.2, a_val=4.45, b_val=1.),
    rupture_mesh_spacing=2.,
    magnitude_scaling_relationship=PointMSR(),
    rupture_aspect_ratio=1.,
    temporal_occurrence_model=PoissonTOM(50.),
    upper_seismogenic_depth=2.,
    lower_seismogenic_depth=12.,
    nodal_plane_distribution=PMF([(1, NodalPlane(strike=0., dip=50, rake=90.))]),
    hypocenter_distribution=PMF([(1, 7.)]),
    polygon=Point(0., 0.).to_polygon(200.),
    area_discretization=10.
)



In [4]:

    
# define area source with finite ruptures
src2 = AreaSource(
    source_id='1',
    name='area',
    tectonic_region_type='Active Shallow Crust',
    mfd=TruncatedGRMFD(min_mag=5., max_mag=6.5, bin_width=0.2, a_val=4.45, b_val=1.),
    rupture_mesh_spacing=2.,
    magnitude_scaling_relationship=WC1994(),
    rupture_aspect_ratio=1.,
    temporal_occurrence_model=PoissonTOM(50.),
    upper_seismogenic_depth=2.,
    lower_seismogenic_depth=12.,
    nodal_plane_distribution=PMF([(1, NodalPlane(strike=0, dip=50, rake=90))]),
    hypocenter_distribution=PMF([(1, 7.)]),
    polygon=Point(0., 0.).to_polygon(200.),
    area_discretization=10.
)



In [5]:

    
# compute hazard curve from src1
imls = [0.005, 0.007, 0.0098, 0.0137, 0.0192, 0.0269, 0.0376, 0.0527, 0.0738, 0.103, 0.145,
        0.203, 0.284, 0.397, 0.556, 0.778, 1.09, 1.52, 2.13]
curves1 = calc_hazard_curves(
    groups=[src1],
    ss_filter=SiteCollection([Site(location=Point(0., 0.), vs30=760., vs30measured=True, z1pt0=40., z2pt5=1.)]),
    imtls={'PGA': imls},
    gsim_by_trt={'Active Shallow Crust': CampbellBozorgnia2008()},
    truncation_level=None
)



In [6]:

    
# compute hazard curve from src2
curves2 = calc_hazard_curves(
    groups=[src2],
    ss_filter=SiteCollection([Site(location=Point(0., 0.), vs30=760., vs30measured=True, z1pt0=40., z2pt5=1.)]),
    imtls={'PGA': imls},
    gsim_by_trt={'Active Shallow Crust': CampbellBozorgnia2008()},
    truncation_level=None
)



In [7]:

    
fig = pyplot.figure(figsize=(9, 9))
pyplot.loglog(imls, curves1['PGA'][0], '-r', linewidth=2, label='Point Ruptures - PGA')
pyplot.loglog(imls, curves2['PGA'][0], '-g', linewidth=2, label='Finite Ruptures - PGA')
pyplot.legend(loc="upper left", bbox_to_anchor=(1,1))
pyplot.xlabel('SA (g)', fontsize=20)
pyplot.ylabel('Probability of exceedance in 50 years', fontsize=20)









    Out[7]:





<matplotlib.text.Text at 0x109256490>

Hazard curves from area sources with different nodal planes



In [8]:

    
# define area source with vertical strike-slip ruptures
src1 = AreaSource(
    source_id='1',
    name='area',
    tectonic_region_type='Active Shallow Crust',
    mfd=TruncatedGRMFD(min_mag=5., max_mag=6.5, bin_width=0.2, a_val=4.45, b_val=1.),
    rupture_mesh_spacing=2.,
    magnitude_scaling_relationship=WC1994(),
    rupture_aspect_ratio=1.,
    temporal_occurrence_model=PoissonTOM(50.),
    upper_seismogenic_depth=2.,
    lower_seismogenic_depth=12.,
    nodal_plane_distribution=PMF([(1, NodalPlane(strike=0., dip=90, rake=0.))]),
    hypocenter_distribution=PMF([(1, 7.)]),
    polygon=Point(0., 0.).to_polygon(200.),
    area_discretization=10.
)



In [9]:

    
# define area source with dipping (50 degrees) reverse ruptures
src2 = AreaSource(
    source_id='1',
    name='area',
    tectonic_region_type='Active Shallow Crust',
    mfd=TruncatedGRMFD(min_mag=5., max_mag=6.5, bin_width=0.2, a_val=4.45, b_val=1.),
    rupture_mesh_spacing=2.,
    magnitude_scaling_relationship=WC1994(),
    rupture_aspect_ratio=1.,
    temporal_occurrence_model=PoissonTOM(50.),
    upper_seismogenic_depth=2.,
    lower_seismogenic_depth=12.,
    nodal_plane_distribution=PMF([(1, NodalPlane(strike=0, dip=50, rake=90))]),
    hypocenter_distribution=PMF([(1, 7.)]),
    polygon=Point(0., 0.).to_polygon(200.),
    area_discretization=10.
)



In [10]:

    
# compute hazard curve from src1
imls = [0.005, 0.007, 0.0098, 0.0137, 0.0192, 0.0269, 0.0376, 0.0527, 0.0738, 0.103, 0.145,
        0.203, 0.284, 0.397, 0.556, 0.778, 1.09, 1.52, 2.13]
curves1 = calc_hazard_curves(
    groups=[src1],
    ss_filter=SiteCollection([Site(location=Point(0., 0.), vs30=760., vs30measured=True, z1pt0=40., z2pt5=1.)]),
    imtls={'PGA': imls},
    gsim_by_trt={'Active Shallow Crust': CampbellBozorgnia2008()},
    truncation_level=None
)



In [11]:

    
# compute hazard curve from src2
curves2 = calc_hazard_curves(
    groups=[src2],
    ss_filter=SiteCollection([Site(location=Point(0., 0.), vs30=760., vs30measured=True, z1pt0=40., z2pt5=1.)]),
    imtls={'PGA': imls},
    gsim_by_trt={'Active Shallow Crust': CampbellBozorgnia2008()},
    truncation_level=None
)



In [12]:

    
fig = pyplot.figure(figsize=(9, 9))
pyplot.loglog(imls, curves1['PGA'][0], '-r', linewidth=2, label='strike-slip - PGA')
pyplot.loglog(imls, curves2['PGA'][0], '-g', linewidth=2, label='reverse - PGA')
pyplot.legend(loc="upper left", bbox_to_anchor=(1,1))
pyplot.xlabel('SA (g)', fontsize=20)
pyplot.ylabel('Probability of exceedance in 50 years', fontsize=20)









    Out[12]:





<matplotlib.text.Text at 0x10971c890>



In [ ]: