analysis.apply_edwards#

seismostats.analysis.apply_edwards(mag_type: str, mag: float) → Series#

Converts local magnitudes to moment magnitudes according Edwards et al. (2010).

Parameters:

  • mag_type – Magnitude type.

  • mag – Magnitude value.

Returns:

pd.Series – Magnitude type and value.

Source:

Edwards, B., Allmann, B., Fäh, D., & Clinton, J. (2010). Automatic computation of moment magnitudes for small earthquakes and the scaling of local to moment magnitude. Geophysical Journal International, 183(1), 407-420.

Examples

>>> from seismostats.analysis.magnitudes import apply_edwards
>>> apply_edwards('ML', 3.0)
0    Mw_converted
1          2.8779

>>> import pandas as pd
>>> from seismostats import Catalog
>>> data = {'longitude': [0, 1, 2],
...         'latitude': [0, 1, 2],
...         'depth': [0, 1, 2],
...         'time': pd.to_datetime(['2021-01-01 00:00:00',
...                                 '2021-01-01 10:00:00',
...                                 '2021-01-01 20:00:00']),
...         'magnitude': [1, 2, 3],
            'mag_type': ['ML', 'Mw', 'Ml']}
>>> catalog = Catalog(data)
>>> for index, row in catalog.iterrows():
...     converted = apply_edwards(row['mag_type'], row['magnitude'])
...     catalog.at[index, 'mag_type'] = converted[0]
...     catalog.at[index, 'magnitude'] = converted[1]
>>> catalog
longitude       latitude        depth   time    magnitude       mag_type
0       0       0       0       2021-01-01 00:00:00     1.5411  Mw_converted
1       1       1       1       2021-01-01 10:00:00     2.0000  Mw
2       2       2       2       2021-01-01 20:00:00     2.8779  Mw_converted
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