pySLAMMER ships with a small suite of recorded ground motions so that users can run analyses out of the box without sourcing acceleration records. The suite is intentionally compact — it spans a useful range of magnitude, duration, and frequency content for testing and demonstration, but it is not intended as a hazard-consistent record set for design.
Loading motions in code
All bundled motions are exposed as a dictionary of GroundMotion objects:
import pyslammer as slammotions = slam.sample_ground_motions()list(motions)
For an example using one of these motions end-to-end, see the rigid/flexible analysis example. A custom_ground_motion example covering how to use your own record is planned.
Suite summary
The table below summarizes the recorded characteristics of each motion. Values are taken from the original strong-motion records as digitized for the suite.
Code
import pandas as pdfrom pathlib import Pathsummary = pd.read_csv(Path("..") /"_static"/"gm_summary.csv")summary
Table 1: Bundled ground motions and their key engineering parameters.
Earthquake
Record
Digitization interval
Magnitude
Arias intensity (m/s)
Duration (5-95%)
PGA (g)
PGV (m/s)
Mean period (s)
Epicentral distance (km)
Focal distance (km)
Rupture distance (km)
Focal mechanism
0
Cape Mendocino 1992
PET-090
0.020
7.1
3.822
16.1
0.662
90.1
0.68
4.5
10.5
8.2
Reverse
1
Chi-Chi, Taiwan 1999
TCU068-090
0.005
7.6
3.303
12.5
0.566
176.9
1.50
47.9
48.5
0.3
Obl. reverse
2
Coalinga 1983
PVB-045
0.005
6.4
1.571
8.1
0.380
32.4
0.61
10.0
11.0
8.4
Reverse
3
Coyote Lake 1979
G02-050
0.005
5.7
0.287
7.5
0.211
11.0
0.37
10.9
13.6
9.0
Strike-slip
4
Duzce, Turkey 1999
375-090
0.010
7.1
2.037
13.2
0.514
20.4
0.29
24.1
27.8
3.9
Strike-slip
5
Imperial Valley 1979
BCR-230
0.005
6.5
5.990
9.8
0.775
45.9
0.47
6.2
11.7
2.7
Strike-slip
6
Kobe, Japan 1995
TAK-090
0.010
6.9
8.134
9.9
0.616
120.7
0.99
13.1
22.2
1.5
Strike-slip
7
Kocaeli, Turkey 1999
ATS-090
0.005
7.5
1.240
37.2
0.185
32.8
0.98
112.3
113.4
69.6
Strike-slip
8
Landers 1992
LCN-345
0.005
7.3
6.588
13.9
0.789
32.5
0.17
44.0
44.6
2.2
Strike-slip
9
Loma Prieta 1989
HSP-000
0.005
6.9
2.205
16.4
0.371
62.3
0.95
48.2
51.3
27.9
Obl. reverse
10
Mammoth Lakes-1 1980
CVK-090
0.005
6.1
2.256
9.2
0.416
23.2
0.32
1.4
9.1
6.6
Obl. normal
11
Mammoth Lakes-2 1980
CVK-090
0.005
5.9
0.394
6.8
0.266
19.0
0.39
12.0
18.5
NaN
Strike-slip
12
Morgan Hill 1984
CYC-285
0.005
6.2
3.850
3.2
1.298
80.8
0.55
24.6
26.0
0.5
Strike-slip
13
N. Palm Springs 1986
WWT-180
0.005
6.1
1.768
5.4
0.492
34.7
0.35
4.2
11.8
6.0
Obl. reverse
14
Nahanni, Canada 1985
NS1-280
0.005
6.8
3.852
8.1
1.096
46.1
0.36
6.8
10.5
9.6
Reverse
15
Nisqually 2001
UNR-058
0.010
6.8
1.458
31.6
0.274
22.9
0.69
57.6
77.9
77.9
Normal
16
Northridge 1994
PAC-175
0.020
6.7
0.936
4.3
0.415
45.8
0.47
20.4
26.9
7.0
Reverse
17
Northridge 1994
VSP-360
0.005
6.7
6.987
8.5
0.934
76.2
0.46
8.5
19.5
8.4
Reverse
Response spectra
The 5%-damped acceleration response spectra for the suite are plotted on the SLAMMER verification page, where the suite is used as the motion set for the verification study.
Bringing your own motion
The sample suite is a convenience, not a constraint. Any 1-D acceleration array (in \(g\)) plus a timestep can be wrapped as a slam.GroundMotion(accel, dt, name=...) and used identically. A dedicated example is planned (custom_ground_motion.qmd).