obspy.signal.trigger.modified_energy_ratio

modified_energy_ratio(a, nsta, power=3)

Modified energy ratio detector.

Improvement of the energy_ratio() that accounts for the signal itself:

$$\text{mer}(i)=(\text{er}(i)\ast |a(i)|{)}^3$$

where $texter(i)$ is the energy_ratio().

Parameters:

• a (NumPy ndarray) – Seismic Trace

• nsta (int) – Length of energy ratio window in samples. It’s the same length as nsta in the classical STA/LTA methods.

• power (int) – The power exponent in the equation above. Default: 3

Return type:

NumPy ndarray

Returns:

Modified Energy Ratio