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Nov 21, 2022
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Improve gallery example "meca.py" #2199

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Improve formulation in example 'meca.py'
yvonnefroehlich Nov 20, 2022
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Use 'spec' parameter name in code in example 'meca.py'
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Improve comments in example 'meca.py'
yvonnefroehlich Nov 20, 2022
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Improve convention formulation in example 'meca.py'
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Merge branch 'main' into improve-examp-meca-01
yvonnefroehlich Nov 21, 2022
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Merge branch 'main' into improve-examp-meca-01
yvonnefroehlich Nov 21, 2022
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23 changes: 15 additions & 8 deletions examples/gallery/seismology/meca.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2,18 +2,18 @@
Focal mechanisms
----------------

The :meth:`pygmt.Figure.meca` method can plot focal mechanisms, or beachballs.
The :meth:`pygmt.Figure.meca` method can plot focal mechanisms or beachballs.
We can specify the focal mechanism nodal planes or moment tensor components as
a dict using the ``spec`` parameter (or they can be specified as a 1d or 2d
array, or within a specified file). The size of plotted beachballs can be
a dictionary using the ``spec`` parameter (or they can be specified as a 1d or
2d array, or within a specified file). The size of plotted beachballs can be
specified using the ``scale`` parameter.
"""

import pygmt

fig = pygmt.Figure()

# generate a basemap near Washington state showing coastlines, land, and water
# generate a map near Washington State showing land, water, and shorelines
fig.coast(
region=[-125, -122, 47, 49],
projection="M6c",
Expand All @@ -23,11 +23,18 @@
frame="a",
)

# store focal mechanisms parameters in a dict
# store focal mechanism parameters in a dictionary based on the Aki & Richards
# convention
focal_mechanism = dict(strike=330, dip=30, rake=90, magnitude=3)

# pass the focal mechanism data to meca in addition to the scale and event
# location
fig.meca(focal_mechanism, scale="1c", longitude=-124.3, latitude=48.1, depth=12.0)
# pass the focal mechanism data through the spec parameter. In addition provide
# scale, event location, and event depth
fig.meca(
spec=focal_mechanism,
scale="1c", # in centimeters
longitude=-124.3,
latitude=48.1,
depth=12.0,
)

fig.show()