Principal Investigator for the Triton Initiative and Earth Scientist
Principal Investigator for the Triton Initiative and Earth Scientist


Joe Haxel is the principal investigator of the Triton Initiative and an Earth scientist in the Coastal Sciences Division at the Marine and Coastal Research Laboratory at PNNL-Sequim. Joe received his BS in Geological Sciences from the University of California Santa Barbara with a focus on earth systems science, an MS in oceanography from Oregon State University specializing in nearshore processes, and a PhD in marine geology from Oregon State University working with acoustics in the northeast Pacific. His current work is largely focused on environmental monitoring for marine energy with a specialization in underwater noise and passive acoustic monitoring.

Dr. Haxel joined the Pacific Northwest National Laboratory (PNNL) in 2020 leading a project focused on technology and methods for environmental monitoring around marine energy (Triton). Prior to joining PNNL, he spent 20 years in NOAA’s Pacific Marine Environmental Laboratory Acoustics Program with a joint appointment at Oregon State University leading passive acoustic research and technology development addressing multi-disciplinary research focused on geophysical and biological marine studies. He has participated in research cruises in oceans all over the world, deploying and recovering oceanographic instrumentation and has been the acoustic monitoring task lead of the DOE supported PacWave open ocean wave energy conversion device testing project at Oregon State University since 2009. His current research interests include developing novel passive acoustic technologies for deployment on fixed mooring and mobile (gliders, drifters, floats) platforms for ocean soundscape analysis and acoustic measurements around marine energy.

Research Interests

  • Environmental monitoring for marine energy
  • Passive acoustic technologies
  • Integrating marine energy with ocean observing
  • Underwater soundscapes and the effects of anthropogenic noise on marine ecosystems
  • Autonomous mobile observing platforms


BS in Geological Sciences, University of California at Santa Barbara

MS in Oceanography, Oregon State University

PhD in Marine Geology, Oregon State University



Haver, S.M., Z. Rand, L.T. Hatch, D. Lipski, R.P. Dziak, J. Gedamke, J. Haxel, S.A. Heppell, J. Jahncke, M.F. McKenna, D.K. Mellinger, W.K. Oestreich, L. Roche, J. Ryan, and S.M. Van Parijs (2020): Seasonal trends and primary contributors to the low-frequency soundscape of the Cordell Bank National Marine SanctuaryJ. Acoust. Soc. Am.148(2), 845, doi: 10.1121/10.0001726, View online.

Matsumoto, H., J. Haxel, B. Kahn, L. Roche, R.P. Dziak, A. Turpin, J. Childress, K. Sexton, H. Klinck, and T. Nakamura (2020): Field testing and performance evaluation of the long-term acoustic real-time sensor for polar areas (LARA). IEEE Oceans 2019, Seattle, WA, October 27–31, 2019, View online.

Sremba, A.L., R.P. Dziak, C.S. Baker, B.R. Mate, C.E. Hayslip, D.J. Steel, J.H. Haxel, D.M. Palacios, J.C. Calambokidis, and A. Širović (2020): ‘Genoustics’: Combining near-field acoustic records and genetic identity of an individual blue whale off the central Oregon coast. MTS/IEEE Oceans19, 27−31 October 2019, View online.

Tepp, G., R.P. Dziak, M.M. Haney, J. Power, C. Searcy, J.J. Lyons, H. Matsumoto, and J.H. Haxel (2020): Seismic and hydroacoustic observations of the 2016-17 Bogoslof eruptionBull. Volcanol.82, 4, doi: 10.1007/s00445-019-1344-3, View online.


Dziak, R.P., W.S. Lee, J.H. Haxel, H. Matsumoto, G. Tepp, T.-K. Lau, L. Roche, S. Yun, C.-K. Lee, J. Lee, and S.-T. Yoon (2019): Hydroacoustic, meteorologic and seismic observations of the 2016 Nansen ice shelf calving event and iceberg formationFront. Earth Sci.7, 183, doi: 10.3389/feart.2019.00183, View online.

Haver, S.M., M.E.H. Fournet, R.P. Dziak, C. Gabriele, J. Gedamke, L.T. Hatch, J. Haxel, S.A. Heppell, M.F. McKenna, D.K. Mellinger, and S.M. Van Parijs (2019): Comparing the underwater soundscapes of four U.S. national parks and marine sanctuariesFront. Mar. Sci.6, 500, doi: 10.3389/fmars.2019.00500, View online.

Haxel, J.H., H. Matsumoto, C. Meinig, G. Kalbach, T.-K.A. Lau, R.P. Dziak, and S. Stalin (2019): Ocean sound levels in the northeast Pacific recorded from an autonomous underwater gliderPLoS One14(11), e0225325, doi: 10.1371/journal.pone.0225325, View online.

Holdman, A.K., J.H. Haxel, H. Klinck, and L.G. Torres (2019): Acoustic monitoring reveals the times and tides of harbor porpoise (Phocoena phocoena) distribution off central Oregon, U.S.A.Mar. Ecol. Prog. Ser.35(1), 164–186, doi: 10.1111/mms.12537, View online.


Dziak, R., D. Bohnenstiehl, A. Lau, J. Conder, H. Matsumoto, J. Haxel, and A. Semple (2018): Lau Basin T-wave earthquake location catalog, 2009-2010 (investigators Dziak, Bohnenstiehl, Lau, Condor, Matsumoto, Haxel, Semple). Interdisciplinary Earth Data Alliance (IEDA), Marine Geoscience Data System (MGDS), doi: 10.1594/IEDA/324411, Data product at

Dziak, R.P., W.S. Lee, S. Yun, C.-K. Lee, J.H. Haxel, T.-K. Lau, H. Matsumoto, L. Roche, and G. Tepp (2018): The 2016 Nansen Ice Shelf calving event: Hydroacoustic and meteorological observations of ice shelf fracture and iceberg formation. In 2018 OCEANS MTS/IEEE Kobe Techno-Ocean (OTO), Kobe, Japan, 28–31 May 2018, View online.

Haver, S.M., J. Gedamke, L.T. Hatch, R.P. Dziak, S. Van Parijs, M.F. McKenna, J.P. Barlow, C. Berchok, E. DiDonato, B. Hanson, J. Haxel, M. Holt, D. Lipski, H. Matsumoto, C. Meinig, D.K. Mellinger, S.E. Moore, E.M. Oleson, M.S. Soldevilla, and H. Klinck (2018): Monitoring long-term soundscape trends in U.S. waters: The NOAA/NPS Ocean Noise Reference Station NetworkMar. Policy90, 6–13, doi: 10.1016/j.marpol.2018.01.023.

Wilcock, W.S.D., R.P. Dziak, M. Tolstoy, W.W. Chadwick, Jr., S.L. Nooner, D.R. Bohnenstiehl, J. Caplan-Auerbach, F. Waldhauser, A.F. Arnulf, C. Baillard, T.-K. Lau, J.H. Haxel, Y.J. Tan, C. Garcia, S. Levy, and M.E. Mann (2018): The recent volcanic history of Axial Seamount: Geophysical insights into past eruption dynamics with an eye toward enhanced observations of future eruptionsOceanography31(1), 114–123, doi: 10.5670/oceanog.2018.117.


Caplan-Auerbach, J., R.P. Dziak, J. Haxel, D.R. Bohnenstiehl, and C. Garcia (2017): Explosive processes during the 2015 eruption of Axial Seamount, as recorded by seafloor hydrophonesGeochem. Geophys. Geosyst.18(4), 1761–1774, doi: 10.1002/2016GC006734.

Dziak, R.P., J.H. Haxel, T.-K. Lau, S. Heimlich, J. Caplan-Auerbach, D.K. Mellinger, H. Matsumoto, and B. Mate (2017): A pulsed-air model of blue whale B call vocalizationsScientific Reports7, 9122, doi: 10.1038/s41598-017-09423-7, Available online.

Dziak, R.P., J.H. Haxel, H. Matsumoto, T.-K. Lau, S. Heimlich, S. Nieukirk, D.K. Mellinger, J. Osse, C. Meinig, N. Delich, and S. Stalin (2017): Ambient sound at Challenger Deep, Mariana TrenchOceanography30(2), 186–197, doi: 10.5670/oceanog.2017.240.

Dziak, R.P., J. Hong, S.-G. Kang, T.-K. Lau, J.H. Haxel, and H. Matsumoto (2017): The Balleny Island hydrophone array: Hydro-acoustic records of sea-ice dynamics, seafloor volcano-tectonic activity, and marine mammal vocalizations off Antarctica. In OCEANS'17 MTS/IEEE, Aberdeen, 19–22 June 2017.

Schnur, S.R., W.W. Chadwick, Jr., R.W. Embley, V.L. Ferrini, C.E.J. de Ronde, K.V. Cashman, N. Deardorff, S.G. Merle, R.P. Dziak, J. Haxel, and H. Matsumoto (2017): A decade of volcanic construction and destruction at the summit of NW-Rota-1 Seamount: 2004–2014J. Geophys. Res.122(3), 1558–1584, doi: 10.1002/2016JB013742.


Haxel, J., A. Turpin, H. Matsumoto, H. Klinck, D. Hellin, and S. Henkel (2016): A portable, real-time passive acoustic system and autonomous hydrophone array for noise monitoring of offshore wave energy projects. In Proceedings of the 4th Annual Marine Energy Technology Symposium 2016, National Hydropower Association Water Week, National Hydropower Association, Washington, DC, 25–27 April 2016. [PDF Version]

Matsumoto, H., A. Turpin, J. Haxel, C. Meinig, M. Craig, D. Tagawa, H. Klinck, and B. Hanson (2016): A real-time acoustic observing system (RAOS) for killer whales. In Oceans '16 MTS/IEEE, Marine Technology Society and Institute of Electrical and Electronics Engineers, IEEE, Monterey, Calif., 19–23 September 2016.


Dziak, R.P., D.R. Bohnenstiehl, K.M. Stafford, H. Matsumoto, M. Park, W.S. Lee, M.J. Fowler, T.-K. Lau, J.H. Haxel, and D.K. Mellinger (2015): Sources and levels of ambient ocean sound near the Antarctic PeninsulaPLoS ONE10(4), e0123425, doi: 10.1371/journal.pone.0123425.

Dziak, R.P., J.H, Haxel, H. Matsumoto, C. Meinig, N. Delich, J. Osse, and M. Wetzler (2015): Deployment and recovery of a full-ocean depth mooring at Challenger Deep, Mariana Trench. In Oceans 2015 MTS/IEEE, Marine Technology Society and Institute of Electrical and Electronics Engineers, Washington, DC, 19–22 October 2015. [PDF Version]

Matsumoto, H., J. Haxel, A. Turpin, S. Fregosi, H. Klinck, K. Klinck, S. Bauman-Pickering, A. Erofeev, J.A. Barth, R.P. Dziak, and C. Jones (2015): Simultaneous operation of mobile acoustic recording systems off the Washington Coast for cetacean studies: System noise level evaluations. In Oceans 2015 MTS/IEEE, Marine Technology Society and Institute of Electrical and Electronics Engineers, Washington, DC, 19–22 October 2015.


Dziak, R.P., H. Matsumoto, D.R. Bohnenstiehl, K.M. Stafford, M. Park, W.S. Lee, H. Klinck, M.J. Fowler, T.-K. Lau, J.H. Haxel, and D.K. Mellinger (2014): Sources of long-term ambient ocean sound near the Antarctic Peninsula. In Proceedings of the 2nd International Conference and Exhibition on Underwater Acoustics (UA2014), Island of Rhodes, Greece, 22–27 June 2014, 157–165. [PDF Version]

Embley, R.W., S.G. Merle, E.T. Baker, K.H. Rubin, J.E. Lupton, J.A. Resing, R.P. Dziak, M.D. Lilley, W.W. Chadwick, Jr., T. Shank, R. Greene, S.L. Walker, J. Haxel, E. Olson, and T. Baumberger (2014): Eruptive modes and hiatus of volcanism at West Mata seamount:, NE Lau basin: 1996–2012Geochem. Geophys. Geosyst.15(10), 4093–4115, doi: 10.1002/2014GC005387.

Matsumoto, H., D.R. Bohnenstiehl, J. Tournadre, R.P. Dziak, J.H. Haxel, T.-K.A. Lau, M. Fowler, and S.A. Salo (2014): Antarctic icebergs: A significant natural ocean sound source in the Southern HemisphereGeochem. Geophys. Geosyst.15(8), 3448–3458, doi: 10.1002/2014GC005454.

Matsumoto, H., R.P. Dziak, D. Bohnenstiehl, J. Tournadre, T.-K. Lau, M. Fowler, J. Haxel, M. Park, and W. Lee (2014): Antarctic's siren call: The sound of icebergs. In Proceedings of the 2nd International Conference and Exhibition on Underwater Acoustics (UA2014), Island of Rhodes, Greece, 22–27 June 2014, 403–410. [PDF Version]


Haxel, J.H., R.P. Dziak, and H. Matsumoto (2013): Observations of shallow water marine ambient sound: the low frequency underwater soundscape of the central Oregon coastJ. Acoust. Soc. Am.133(5), 2586–2596, doi: 10.1121/1.4796132.


Chadwick, Jr., W.W., R.P. Dziak, J.H. Haxel, R.W. Embley, and H. Matsumoto (2012): Submarine landslide triggered by volcanic eruption recorded by in situ hydrophoneGeology40(1), 51–54, doi: 10.1130/G32495.1.

Dziak, R.P., E.T. Baker, A.M. Shaw, D.R. Bohnenstiehl, W.W. Chadwick, Jr., J.H. Haxel, H. Matsumoto, and S.L. Walker (2012): Flux measurements of explosive degassing using a year-long hydroacoustic record at an erupting submarine volcanoGeochem. Geophys. Geosyst.13, Q0AF07, doi: 10.1029/2012GC004211.

Dziak, R.P., J.H. Haxel, D.R. Bohnenstiehl, W.W. Chadwick, Jr., S.L. Nooner, M.J. Fowler, H. Matsumoto, and D.A.. Butterfield (2012): Seismic precursors and magma ascent before the April 2011 eruption at Axial SeamountNature Geosci.5(7), 478–482, doi: 10.1038/ngeo1490.

Goslin, J., J. Perrot, J.-Y. Royer, C. Martin, N. Lourenço, J. Luis, R.P. Dziak, H. Matsumoto, J. Haxel, M.J. Fowler, C.G. Fox, A.T.-K. Lau, and S. Bazin (2012): Spatiotemporal distribution of the seismicity along the Mid-Atlantic Ridge north of the Azores from hydroacoustic data: Insights into seismogenic processes in a ridge-hot spot contextGeochem. Geophys. Geosyst.13, Q02010, doi: 10.1029/2011GC003828.


Haxel, J.H., R.P. Dziak, and H. Matsumoto (2011): Obtaining baseline measurements of ocean ambient sound at a mobile test berth site for wave energy conversion off the central Oregon coast. In Proceedings of Oceans' 11 MTS/IEEE, Kona, IEEE, Piscataway, NJ, 19–22 September 2011, 5 pp, No. 6107223.

Matsumoto, H., D.R. Bohnenstiehl, J.H. Haxel, R.P. Dziak, and R.W. Embley (2011): Mapping the sound field of an erupting submarine volcano using an acoustic gliderJ. Acoust. Soc. Am.129(3), doi: 10.1121/1.3547720.


Dziak, R.P., M. Park, W.S. Lee, H. Matsumoto, D.R. Bohnenstiehl, and J.H. Haxel (2010): Tectonomagmatic activity and ice dynamics in the Bransfield Strait back-arc basin, AntarcticaJ. Geophys. Res.115, B01102, doi: 10.1029/2009JB006295.

Matsumoto, H., S.E. Stalin, R.W. Embley, J.H. Haxel, D.R. Bohnenstiehl, R.P. Dziak, C. Meinig, J.A. Resing, and N.M. Delich (2010): Hydroacoustics of a submarine eruption in the northeast Lau Basin using an acoustic glider. In Oceans 2010 MTS/IEEE Seattle, Washington State Convention and Trade Center, Seattle, WA, 20–23 September, 2010. [PDF Version]

Simão, N., J. Escartín, J. Goslin, J. Haxel, M. Cannat, and R.P. Dziak (2010): Regional seismicity of the Mid-Atlantic Ridge: Observations from autonomous hydrophone arraysGeophys. J. Int.183(3), 1559-1578, doi: 10.1111/j.1365-246X.2010.04815.x.


Dziak, R.P., D.R. Bohnenstiehl, H. Matsumoto, M.J. Fowler, J.H. Haxel, M. Tolstoy, and F. Waldhauser (2009): January 2006 seafloor-spreading event at 9°50′N, East Pacific Rise: Ridge dike intrusion and transform fault interactions from regional hydroacoustic dataGeochem. Geophys. Geosyst.10, Q06T06, doi: 10.1029/2009GC002388.


Dziak, R.P., J.H. Haxel, H. Matsumoto, T.K. Lau, S.M. Merle, C.E.J. de Ronde, R.W. Embley, and D.K. Mellinger (2008): Observations of regional seismicity and local harmonic tremor at Brothers Volcano, south Kermadec arc, using an ocean bottom hydrophone arrayJ. Geophys. Res.113, B08S04, doi: 10.1029/2007JB005533.


Dziak, R.P., D.R. Bohnenstiehl, J.P. Cowen, E.T. Baker, K.H. Rubin, J.H. Haxel, and M.J. Fowler (2007): Rapid dike emplacement leads to eruptions and hydrothermal plume release during seafloor spreading eventsGeology35, 579–582, doi: 10.1130/G23476A.1.

Dziak, R.P., M. Park, H. Matsumoto, D.R. Bohnenstiehl, J.H. Haxel, D.K. Mellinger, K. Stafford, and W.S. Lee (2007): Hydroacoustic monitoring of the Bransfield Strait and Drake Passage, Antarctica: A first analysis of seafloor seismicity, cryogenic acoustic sources, and cetacean vocalizations. In Proceedings of the 10th International Symposium on Antarctic and Earth Science, Santa Barbara, August 2007, 5 pp.

Mellinger, D.K., S.L. Nieukirk, H. Matsumoto, S.L. Heimlich, R.P. Dziak, J. Haxel, M. Fowler, C. Meinig, and H.V. Miller (2007): Seasonal occurrence of North Atlantic right whale (Eubalaena glacialis) vocalizations at two sites on the Scotian ShelfMar. Mamm. Sci.23(4), 856–867, doi: 10.1111/j.1748-7692.2007.00144.x.


Goslin, J., N. Lourenço, R.P. Dziak, D.R. Bohnenstiehl, J. Haxel, and J. Luis (2005): Long-term seismicity of the Reykjanes Ridge (North Atlantic) recorded by a regional hydrophone arrayGeophys. J. Int.162(2), 516–524, doi: 10.1111/j.1365-246X.2005.02678.x.

Haxel, J., and R.P. Dziak (2005): Evidence of explosive seafloor volcanic activity from the Walvis Ridge, South Atlantic OceanGeophys. Res. Lett.32(13), L13609, doi: 10.1029/2005GL023205.


Dziak, R.P., D.R. Bohnensteihl, H. Matsumoto, C.G. Fox, D.K. Smith, M. Tolstoy, T.-K. Lau, J.H. Haxel, and M.J. Fowler (2004): P- and T-wave detection thresholds, Pn velocity estimate, and detection of lower mantle and core P-waves on ocean sound-channel hydrophones at the Mid-Atlantic RidgeBull. Seismol. Soc. Am.94(2), 665–677, doi: 10.1785/0120030156.

Matsumoto, H., S. Nieukirk, M. Fowler, J. Haxel, S. Heimlich, D.K. Mellinger, R. Dziak, and C.G. Fox (2004): Sound in the sea: Hands-on experience with NOAA VENTS Program. In Proceedings of Oceans 2003 Marine Technology and Ocean Science Conference, San Diego, CA, 22–26 September 2003, 1565–1571.

Haxel, J.H., and R.A. Holman. The sediment response of a dissipative beach to variations in wave climate, Marine Geology, June 2004, Vol. 206, 1-4, pp. 73-99, doi:10.1016/j.margeo.2004.02.005m (2004).


Bohnenstiehl, D.R., M. Tolstoy, C.G. Fox, R.P. Dziak, E. Chapp, M. Fowler, J. Haxel, C. Fisher, C. Van Hilst, R. Laird, R. Collier, J. Cowen, M. Lilley, K. Simons, S.M. Carbotte, J.R. Reynolds, and C.H. Langmuir (2003): Anomalous seismic activity at 8° 37–42'N on the East Pacific Rise: Hydroacoustic detection and site investigationRidge 2000 Events1(1), 18–20.