This station was modified from a dm16 digitizer to a dm24 on 20060808. The result is greater amplitude resolution and dynamic range. There are now only 3 channels for each broadband (HH?) instead of the previous 6 channels (i.e. BL? channels are no longer necessary). The digitizer gain is thus changed from about 6.3 microVolts/count to about 1.127 microVolts/count.

Station Code: HENM

Channels: HHZ, HHN, HHE, BLZ, BLN, BLE

Network Code: NM

Location: 36.7160 -89.4717 88.0

Nearest town: Henderson Mound, MO

Opened: July 2, 1999

Sensor Type: CMG40T

Nominally flat to velocity 30 seconds to 50 Hz.

Sensor Serial Number: T4242

Taps: Low gain, non-differential

Vertical

Poles (Hz)Zeros (Hz)
-23.56e(-3) +- 23.56e(-3)i0
-500
159

Normalization: -0.314

Horizontal:

Poles (Hz)Zeros (Hz)
-23.56e(-3) +- 23.56e(-3)i0
-500
159

Velocity Response:

Vertical: 803 V/m/s

North: 804 V/m/s

East: 805 V/m/s

Digitizer Type: DM16

Digitizer Serial Number: T4242/D0022

Digitizer resolution: 16 bits

gain (microV/count)

BLZ: 204.7

BLN: 205.4

BLE: 204.4

HHZ: 6.437

HHN: 6.459

HHE: 6.388

Sample rates:

HH? 100 sps

BL? 20 sps