Seismometer	Guralp CMG-3ESP broadband three-component seismometer. Flat velocity response from 0.033 -50 Hz. Seismometer deployed in separate 17" glass ball. Gimbals will level seismometer if tilt <50°. Option to bury sensor will available in the future.
Pressure Sensor	HiTech crystal hydrophone with low-frequency corner at 0.033 Hz.
Digitizer	Quanterra QA330 low-power 24-bit digitizer. Dynamic range: 135 dB. Data compression. Sample rates: 1-200 Hz.
Clock	Seascan Timebase. Drift rate is 3-5x10-9 (<0.5 ms drift/day before corr.)
Acoustic Telemetry	WHOI-built modem; capable of baud rates of 1 kbit/s or better
Data Offload	Glass ball need not be opened. Transfer rates of at least 1 MByte/s.
Battery Pack	Batteries are stored in two separate 36" long, 7 " i.d. Al pressure cases.
Recording Duration.	Alkaline battery pack will deliver sufficient power for 6 month operation. Lithium battery pack will allow >12 month operation.
Weight	1450/1200 lbs with/without anchor
Pressure Case	17" glass ball for data logger. Two Al pressure cases for batteries
Release	EGG 8242 commercial acoustic release. Backup burnwire acoustic release housed in dedicated 12" glass ball.
Dimensions	5 1/2' x 4' and 4' high
Power Requirement at 20 samples/sec	1.5 W including feedback seismometer, hydrophone preamplifer, and 4- channel data logger.