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Portable Broadband Seismology. Part 3: Data Acquisition System Overview. Jakarta, Indonesia May 11-13, 2006 Bruce Beaudoin Marcos Alvarez Additional thanks to Joseph Steim for use of his slides. Modern Seismic Technology. Inter-networked Digital Communications

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Portable Broadband Seismology

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Portable broadband seismology

Portable Broadband Seismology

Part 3: Data Acquisition System Overview

Jakarta, Indonesia

May 11-13, 2006

Bruce Beaudoin

Marcos Alvarez

Additional thanks to Joseph Steim for use of his slides

Modern seismic technology

Modern Seismic Technology

  • Inter-networked Digital Communications

  • Robust Multiple Telemetry Paths

  • Central Administration and Data Collection

  • Rapid, Reliable Reporting of Information for Disaster Mitigation.

  • High Dynamic Range

  • Portable, Lightweight, Easy to Use

Q330 data engine



Q330 Data Engine

Overview of q330 features

Overview of Q330 features

  • 24-bit A/D

  • 3 or 6 channels (sensor ports A&B)

  • Average power requirement of about 1W, including a power-cycled recorder

  • Internal GPS engine with external antenna

  • VCO is frequency-adjusted to GPS phase lock loop

  • Samples & sends multiplexed, time-stamped UDP packets to a Data Processor (DP) through one of 4 logical data ports:

    • 1,2 - serial or Ethernet telemetry

    • 3 - SOH check by local operator

    • 4 - Baler

  • Also 1 control port for programming/commands (Willard)

  • Communicates by UDP/IP

  • Web server (provides links to DP webserver)

  • Digitizes sensor and SOH streams

Q330 hardware block diagram

Q330 Hardware Block Diagram

Q330 design philosophy

Q330 Design Philosophy

Old fashioned hub and spoke

“Old Fashioned” Hub-and-Spoke


Quanterra multiple connectivity

Quanterra Multiple Connectivity

Data port concept

Data Port Concept

  • Four ports are available

  • Each Data Port is an independent collection of channels and sample rates

  • Each Data Port can use its own SEED channel names or even Station Code

  • Connection to a Data Port is by IP socket, multiple Data Ports can use the same interface, e.g. ethernet or Serial.

Q330 network friendly

Q330 - Network friendly

  • Friendly to Automated Processing. Pure IP

  • Friendly to Remote Maintenance, Configuration, and Network Management

  • Intra and Internet-Ready Security

  • Simple Field and Data Center Management and Setup Procedures, analogous to IP itself

  • Based on modern IP model, not a “dumb” device, e.g. connected through a serial link

Baler 14



Baler 14

Overview of baler14

Overview of Baler14

  • Power cycled DP & data storage unit (19GB)

  • Demultiplexes Q330 packets and writes 4096Kb miniSEED files


  • Web server

  • File transfer by http (10baseT)

  • Q330 manages Baler:

    • Assigns IP address

    • Passes recording parameters

    • Manages most power cycling

  • Runs in acquisition (power cycled) or vacuum (download/continuously powered) modes

Q330 timing clocks

Q330 Timing: Clocks

  • Internal Clocks

    • Time of day clock - keeps rough time when Q330 power is off. Runs on an internal battery.

    • Temperature Compensated Voltage Controled Crystal Oscillator (TCVCXO)

      • Nominal drift of 0.1ppm (<1ms/day)

Q330 timing clocks1

Q330 Timing: Clocks

  • External Clock

    • Q330 has a Motorola M12 GPS engine on-board

    • Default is to power up every 3 hours

    • Adjusts TCVCXO oscillation rate to reduce phase error between GPS 1Hz pulse and TCVCXO 1Hz

    • Stays powered up until phase difference of <5µsec is maintained for 1 minute before powering off the GPS

    • The Q330 retains the last measured phase error before turning off the GPS and applies this constant time correction to all records acquired will GPS is off/unlocked.

Q330 timing time stamps

Q330 Timing: Time Stamps

  • Data is packaged into 1 second data records that are sent to a data processor (DP)

  • Each record includes a time stamp consisting of:

    • Sequence number ≈ seconds since last power-up

    • Seconds of offset since January 1, 2000 of last power-up

    • µsec offset from the current second

  • Q330 also sends

    • A clock status bitmap

    • Minutes since GPS lock was lost

    • Clock phase loop status

  • The baler (DP) queries the Q330 for FIR filter delays and construct the time stamp for the data records using:

Baler and miniseed

Baler and miniseed

  • Once the baler has calculated the time stamp for the data packets it creates 4096 byte miniseed files.

  • The baler uses the best timed 1sec data packet to extrapolate the time for the first sample in a miniseed record

  • The baler also determines a clock quality parameter and writes it to the miniseed header

    • 100% = clock is LOCKED

    • 90% = clock is TRACKING, 3D fix and adjusting TCVCXO

    • 80% = GPS just powered up

    • 10-60% = HOLD, GPS is off. Quality decreases by 1% every 10 minutes

    • 0% - GPS clock has not locked since Q330 power up

Typical timing cycle lce lcq channels

Typical Timing CycleLCE & LCQ channels

Soh channels

SOH Channels

  • ACEVCO quality expressed as SEED Timing blockettes (500)

  • LCE Absolute clock phase error (1 sec / count)

  • LCQ Clock quality times series (1 % / count)

  • LOGState of health, status and timing messages

  • OCFQ330 configuration expressed as SEED opaque data blockettes

  • VCOVCO control voltage (150 mV / count)

  • VEAGPS antenna current (1 mA / count)

  • VECSystem current (1 mA / count)

  • VEPInput voltage (150 mV / count)

  • VKISystem temperature (1 C / count)

  • VMUBoom position of Z or U component (100 mV / count)

  • VMVBoom position of N or V component (100 mV / count)

  • VMWBoom position of N or W component (100 mV / count)

  • VPBBuffer usage (0.1% / count)

Overview of application deployments

Overview of Application deployments

Stand Alone: QNET-QNET-80

Stand Alone + Telemetry

Types of Telemetry


Ethernet Bridge to LAN

IP VSAT (Hughes, Spacenet)

GSM or CDMA Cellular

Serial Q330 to Baler & Ethernet Telemetry: cabling & configuration

Ethernet Q330 to Baler & Serial Telemetry: cabling & configuration

Configuring, Accessing, and Monitoring

Typical portable deployment and 1w power consumption not including sensors

Typical Portable DeploymentAnd ~ 1W Power Consumption (not including sensors)

Ip telemetry deployment

IP Telemetry Deployment



Usarray ta standard site

USArray TA Standard Site

Usarray ta standard site1

USArray TA Standard Site

Gsn ii proposed configuration

GSN II Proposed Configuration




KMI tech team


reference materials


Inter-Program, Quanterra Users Group


BRTT - Antelope (commercial)

ISTI - Mountainaire (open source)

PASSCAL - hocus (open source)

User Documentation

PASSCAL - www.passcal.nmt.edu

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