1. Results of a Recent Instrument Response Test For Three Nodal Seismometers
Dan Hollis (Sisprobe), Florent Brenguier (Sisprobe), Thomas Lecocq (Royal Observatory of Belguim), Larry Ortega (Western Oil Exploration), Jim Franklin (Dolomite Oil),
Marianne Karplus (UTEP), Frank Vernon (SIO)
SITS – 10/30/2018

2. 2015 Instrument Test
a receiver or node
an array

3. 2018 Nodal Instrument Test Test conducted at Piñon Flat Observatory
Broadband station BPH01 used as a control
Deployment duration = 1 Day
Instruments tested:
Quantum 1C 5 Hz
SmartSolo 1C 5 Hz
Zland 3C 5 Hz
a receiver or node
an array

4. 2018 Nodal Instrument Test Node Model Low-cut Filter Gain
Samples per Second
Sensor Sensitivity
Quantum
N/A
24 dB1
250
“high sensitivity geophone”
SmartSolo
LCF = OUT
DC Removal On
24 dB2
78.7 V/m/s
Zland
36 dB
76.7 V/m/s
a receiver or node
an array
Highest Gain Setting
Highest Gain Setting. 3C SmartSolo allows up to 36 dB Gain (personal communication).

5. PSD for BPH01 Control Quiet station. 6-7 second seism stands out.
a receiver or node
an array
Quiet station second seism stands out.
PSD with instrument response correction

6. PSD with instrument response correction
Quantum Results
a receiver or node
an array
PSD with instrument response correction

7. PSD with instrument response correction
SmartSolo Results
a receiver or node
an array
PSD with instrument response correction

8. PSD with instrument response correction
ZLand Results
a receiver or node
an array
PSD with instrument response correction

9. PSDs with instrument response correction
All Results
Quantum
SmartSolo
ZLand
a receiver or node
an array
PSDs with instrument response correction

10. Earthquake Event
a receiver or node
an array

11. PSD without instrument response correction
Earthquake Event
a receiver or node
an array
PSD without instrument response correction

12. 12 hours Continuous Noise
a receiver or node
an array

13. 12 hours Continuous Noise
a receiver or node
an array
PSD without instrument response correction

14. Paths for recording lower frequencies with 5 Hz geophones?
a receiver or node
an array
Lower usable frequencies = greater depth imaging for ambient noise surface wave tomography.
Higher sensitivity geophones (>78 V/m/s)?
More gain options. Highest now is 36 dB. 42 dB? 72 dB?
At what frequency is the geophone response too low to overcome amplifier and A/D noise?