Chapter 9
Transfer Function and Noise Floor
Trillium Compact User Guide
16889R5
2014-03-04
50
9.3 Self-Noise for 20 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). 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 9-3
Self-noise for 20 s models
10
−2
10
−1
10
0
10
1
10
2
−180
−170
−160
−150
−140
−130
−120
PSD (dB wrt 1 m
2
/s
4
/Hz)
Frequency (Hz)
NLNM
NHNM
MLNM
Trillium Compact, 20s 10°
