3.7. Amplitude Intensity Measures

imcalculator.get_amplitude_ims()[source]

Computes amplitude-based intensity measures.

Peak Ground Acceleration (PGA), Peak Ground Velocity (PGV), and Peak Ground Displacement (PGD) are computed from the acceleration time series by successive trapezoidal integration.

Parameters:

None

Returns:

pga (float) – Peak ground acceleration (g).
pgv (float) – Peak ground velocity (m/s).
pgd (float) – Peak ground displacement (m).

Example

import numpy as np
from openquake.vmtk.imcalculator import imcalculator

acc = np.loadtxt("openquake/vmtk/tests/test_data/acceleration.txt")
im = imcalculator(acc, dt=0.005)

pga, pgv, pgd = im.get_amplitude_ims()
print(f"PGA = {pga:.4f} g,  PGV = {pgv:.4f} m/s,  PGD = {pgd:.4f} m")