Chapter 9
Transfer Function and Noise Floor
Trillium Compact User Guide
16889R5
2014-03-04
49
9.2 Self-Noise for 120 s Models
plots typical self-noise for Trillium Compact seismometers. Three curves are
included for reference: Peterson’s new low-noise model (NLNM) and new high-noise
model (NHNM), and McNamara and Buland’s probability density function (PDF) mode low
noise model (MLNM).
1
The noise floor shown is the typical level of instrument self-noise
assuming proper installation. To achieve best performance for any seismometer,
meticulous attention to detail must be paid to choice of site; vault design, if applicable;
and seismometer installation. See
Section 1.3 “Selecting a Site”
Figure 9-2
Self-noise for 120 s models
1. See also:
Jon Peterson,
Observations and Modeling of Seismic Background Noise, Open-File Report 93-922
(Albuquerque, New Mexico: U.S. Department of Interior Geological Survey, 1993).
Daniel E. McNamara and Raymond P. Buland, “Ambient Noise Levels in the Continental United States,”
Bulletin of the Seismological Society of America
94, 4 (August 2004): 1517–1527.
John F. Clinton and Thomas H. Heaton, “Potential Advantages of a Strong-motion Velocity Meter over a
Strong-motion Accelerometer,” Seismological Research Letters 73, 3 (May/June 2002): 332–342.
10
−3
10
−2
10
−1
10
0
10
1
−190
−180
−170
−160
−150
−140
−130
−120
−110
−100
PSD (dB wrt 1 m
2
/s
4
/Hz)
Frequency (Hz)
NLNM
NHNM
MLNM
Trillium Compact
