obspy.signal.invsim.estimate_magnitude¶
-
estimate_magnitude
(paz, amplitude, timespan, h_dist)[source]¶ Estimates local magnitude from poles and zeros or full response of given instrument, the peak to peak amplitude and the time span from peak to peak. Readings on two components can be used in magnitude estimation by providing lists for
paz
,amplitude
andtimespan
.Parameters: - paz – PAZ of the instrument [m/s] (as a dictionary) or response of
the instrument (as
Response
) or list of the same - amplitude – Peak to peak amplitude [counts] or list of the same
- timespan – Timespan of peak to peak amplitude [s] or list of the same
- h_dist – Hypocentral distance [km]
Returns: Estimated local magnitude Ml
Note
Magnitude estimation according to Bakun & Joyner, 1984, Eq. (3) page 1835. Bakun, W. H. and W. B. Joyner: The Ml scale in central California, Bull. Seismol. Soc. Am., 74, 1827-1843, 1984
Example
>>> paz = {'poles': [-4.444+4.444j, -4.444-4.444j, -1.083+0j], ... 'zeros': [0+0j, 0+0j, 0+0j], ... 'gain': 1.0, 'sensitivity': 671140000.0} >>> mag = estimate_magnitude(paz, 3.34e6, 0.065, 0.255) >>> print(round(mag, 6)) 2.132873 >>> mag = estimate_magnitude([paz, paz], [3.34e6, 5e6], [0.065, 0.1], ... 0.255) >>> print(round(mag, 6)) 2.347618
- paz – PAZ of the instrument [m/s] (as a dictionary) or response of
the instrument (as