Optimal Intensity Measures for Probabilistic Seismic Stability Assessment of Large Open-Pit Mine Slopes under Different Mining Depths

Table 5

Candidate intensity measures for this study.

No.	Categories	IM	Description	Definition	Units
1	Acceleration-related	PGA	Peak ground acceleration	Max (|a (t)|)	m/s^2
2		SMA	Sustained maximum acceleration	3rd largest peak in acceleration time history	m/s^2
3		Ia	Arias intensity		m/s
4		CAV	Cumulative absolute velocity		m/s
5		ARMS	Acceleration root-mean-square		m/s^2
6		Ic	Characteristic intensity		—
7		EDA	Effective design acceleration	Peak acceleration value remaining after filtering out frequencies beyond 9 Hz	m/s^2
8		A95	A95 parameter	95% acceleration level of total arias intensity	m/s^2
9		Sa (T1)	Spectral acceleration at T1		m/s^2
10		Sa (1.5T1)	Spectral acceleration at 1.5T1		m/s^2
11	ASI	Acceleration spectrum intensity		m/s
12	EPA	Effective peak acceleration		m/s^2
13	Velocity-related	PGV	Peak ground velocity	Max (|v(t)|)	m/s
14		SMV	Sustained maximum velocity	3rd largest peak in velocity time history	m/s
15			Velocity root-mean-square		m/s
16		SED	Specific energy density		m^2/s
17		FR1	Frequency ratio 1	PGV/PGA	s
18		Sv (T1)	Spectral velocity at T1		m/s
19		Sv (1.5T1)	Spectral velocity at 1.5T1		m/s
20		VSI	Velocity spectrum intensity		m
21		EPV	Effective peak velocity		m/s
22		HI	Housner intensity		m
23	Displacement-related	PGD	Peak ground displacement	Max (|d(t)|)	m
24		DRMS	Displacement root-mean-square		m
25		FR2	Frequency ratio 2	PGD/PGV	s
26		Sd (T1)	Spectral displacement at T1		m
27		Sd (1.5T1)	Spectral displacement at 1.5T1		m
28		DSI	Displacement spectrum intensity		—
29	Duration-related	D5–95	Significant duration		s