Tim Orr



University of Hawaii at Manoa, PH.D. (2015) – Geology and Geophysics

Northern Arizona University, M.S. (1997) – Geology

University of Montana, B.A. (1995) – Geology

University of Montana, B.A. (1993) – Geography



U.S. Geological Survey – Hawaiian Volcano Observatory: Geologist, 2002–present (Research and monitoring of Kilauea Volcano)

Arizona Geological Survey: Geologist/GIS Specialist, 1998–2002 (Geologic mapping, GIS database design and map cartography)





Skelton A, Sturkell E, Jakobsson M, Einarsson D, Tollefsen E, Orr T (2016) Dimmuborgir: a rootless shield complex in northern Iceland. Bull. Volcanol. 78(5):1-14

Poland M, Orr T, Kauahikaua J, Brantley S, Babb J, Patrick M, Neal C, Anderson K, Antolik L, Burgess M, Elias T, Fuke S, Fukunaga P, Johanson I, Kagimoto M, Kamibayashi K, Lee L, Miklius A, Million W, Moniz C, Okubo P, Sutton A, Takahashi T, Thelen W, Tollett W, Trusdell F (2016) The 2014–2015 Pāhoa lava flow crisis at Kīlauea Volcano, Hawai‘i: Disaster avoided and lessons learned. GSA TODAY 26(2):4–10

Patrick MR, Swanson D, Orr T (2016) Automated tracking of lava lake level using thermal images at Kīlauea Volcano, Hawai’i. J Appl. Volcanol. 5(1):1-7

Patrick MR, Orr T, Sutton AJ, Lev E, Thelen W, Fee D (2016) Shallowly driven fluctuations in lava lake outgassing (gas pistoning), Kīlauea Volcano. Earth Planet Sci Lett 433

Houghton BF, Taddeucci J, Andronico D, Gonnermann HM, Pistolesi M, Patrick MR, Orr TR, Swanson DA, Edmonds M, Gaudin D, Carey RJ, Scarlato P (2016) Stronger or longer: Discriminating between Hawaiian and Strombolian eruption styles. Geology 44(2):163-166

Orr TR, Bleacher JE, Patrick MR, Wooten KM (2015) A sinuous tumulus over an active lava tube at Kīlauea Volcano: Evolution, analogs, and hazard forecasts. J. Volcanol. Geotherm. Res. 291(0):35-48

Orr TR, Poland MP, Patrick MR, Thelen WA, Sutton AJ, Elias T, Thornber CR, Parcheta C, Wooten KM (2015) Kīlauea's 5–9 March 2011 Kamoamoa Fissure Eruption and Its Relation to 30+ Years of Activity From Pu‘u ‘Ō ‘ō, in Carey RJ, et al. (eds.), Hawaiian Volcanism, from Source to Surface, AGU Monograph 208, 393–420.

Rowe MC, Thornber CR, Orr TR (2015), Primitive components, crustal assimilation, and magmatic degassing during the early 2008 Kīlauea Summit Eruptive Activity, in Carey RJ, et al. (eds.), Hawaiian Volcanism, from Source to Surface, AGU Monograph 208, 439–455.

Thornber CR, Orr TR, Heliker C, Hoblitt RP (2015) Petrologic Testament to Changes in Shallow Magma Storage and Transport during 30+ Years of Recharge and Eruption at Kīlauea Volcano, Hawai‘i, in Carey RJ, et al. (eds.), Hawaiian Volcanism, from Source to Surface, AGU Monograph 208, 147–188.

Patrick MR, Orr T, Lee L, Monix C (2015) A multipurpose camera system for monitoring Kīlauea Volcano, Hawai‘i. U.S. Geological Survey Techniques and Methods, book 13, chapter A2:25

Patrick MR, Kauahikaua J, Orr T, Davies A, Ramsey M (2015) Operational thermal remote sensing and lava flow monitoring at the Hawaiian Volcano Observatory. Geological Society, London, Special Publications 426

Patrick MR, Anderson KR, Poland MP, Orr TR, Swanson DA (2015) Lava lake level as a gauge of magma reservoir pressure and eruptive hazard. Geology, 43(9) 831–834.

Orr T (2014) The June-July 2007 collapse and refilling of Puʻu ʻŌʻō Crater, Kilauea Volcano, Hawaiʻi. In: U.S. Geological Survey Scientific Investigations Report 2014–5124. p 15

Patrick M, Orr T, Antolik L, Lee L, Kamibayashi K (2014) Continuous monitoring of Hawaiian volcanoes with thermal cameras. J Appl. Volcanol. 3(1):1-19

Carbone D, Poland MP, Patrick MR, Orr TR (2013) Continuous gravity measurements reveal a low-density lava lake at Kīlauea Volcano, Hawai‘i. Earth Planet. Sci. Lett. 376(0):178-185

Houghton BF, Swanson DA, Rausch J, Carey RJ, Fagents SA, Orr TR (2013) Pushing the Volcanic Explosivity Index to its limit and beyond: Constraints from exceptionally weak explosive eruptions at Kīlauea in 2008. Geology 41(6):627-630

Koeppen WC, Patrick M, Orr T, Sutton AJ, Dow D, Wright R (2013) Constraints on the partitioning of Kīlauea’s lavas between surface and tube flows, estimated from infrared satellite data, sulfur dioxide emission rates, and field observations. Bull. Volcanol. 75(5):1-18

Lundgren P, Poland M, Miklius A, Orr T, Yun S-H, Fielding E, Liu Z, Tanaka A, Szeliga W, Hensley S, Owen S (2013) Evolution of dike opening during the March 2011 Kamoamoa fissure eruption, Kīlauea Volcano, Hawai`i. Journal of Geophysical Research: Solid Earth:1–18

Patrick M, Orr T, Sutton AJ, Elias T, Swanson D (2013), The first five years of Kīlauea's summit eruption in Halemaʻumaʻu, 2008–2013, US Geol. Surv.Fact Sheet 2013–3116, 4 p.

Orr, T. R., W. A. Thelen, M. R. Patrick, D. A. Swanson, and D. C. Wilson (2013), Explosive eruptions triggered by rockfalls at Kīlauea volcano, Hawai‘i, Geology, 41(2), 207–210.

Orr, T.R., C. Heliker, and M. R. Patrick (2013), The ongoing Puʻu ‘Ō‘ō eruption of Kīlauea Volcano, Hawaiʻi—30 years of eruptive activity: U.S. Geological Survey Fact Sheet 2012–3127, 6 p. (Available at http://pubs.usgs.gov/fs/2012/3127/.)

Orr, T. R., and J. C. Rea (2012), Time-lapse camera observations of gas piston activity at Puʻu ‘Ō‘ō, Kīlauea volcano, Hawai‘i: Bulletin of Volcanology, v. 74, no. 10, p. 2353-2362.

Carey, R. J., M. Manga, W. Degruyter, D. Swanson, B. Houghton, T. Orr, and M. Patrick (2012), Externally triggered renewed bubble nucleation in basaltic magma: The 12 October 2008 eruption at Halema‘uma‘u Overlook vent, Kīlauea, Hawai‘i, USA: Journal of Geophysical Research: Solid Earth, v. 117, no. B11, p. n/a-n/a.

Hoblitt, R. P., T. R. Orr, C. Heliker, R. P. Denlinger, K. Hon, and P. F. Cervelli (2012), Inflation rates, rifts, and bands in a pāhoehoe sheet flow: Geosphere, v. 8, no. 1, p. 179-195.

Patrick, M., and T. Orr (2012), Rootless shield and perched lava pond collapses at Kīlauea Volcano, Hawaiʻi: Bulletin of Volcanology, v. 74, no. 1, p. 67-78.

Patrick, M., D. Wilson, D. Fee, T. Orr, and D. Swanson (2011), Shallow degassing events as a trigger for very-long-period seismicity at Kīlauea Volcano, Hawai‘i: Bulletin of Volcanology, v. 73, no. 9, p. 1179-1186.

Hon, K., and T. Orr (2011), Hydrothermal hexahydrite spherules erupted during the 2008–2010 summit eruption of Kīlauea Volcano, Hawai‘i: Bulletin of Volcanology, v. 73, no. 9, p. 1369-1375.

Fee, D., M. Garces, T. Orr, and M. Poland (2011), Infrasound from the 2007 fissure eruptions of Kīlauea Volcano, Hawaiʻi, Geophys. Res. Lett., 38(L06309), doi:10.1029/2010GL046422.

Orr, T. R. (2011), Lava tube shatter rings and their correlation with lava flux increases at Kīlauea Volcano, Hawai‘i: Bulletin of Volcanology, v. 73, no. 3, p. 335-346.

Patrick, M. R., T. Orr, D. Wilson, D. Dow, and R. Freeman (2011), Cyclic spattering, seismic tremor, and surface fluctuation within a perched lava channel, Kīlauea Volcano, Bull. Volcanol., 73(6), 639–653.

Montgomery-Brown, E. K., D. K. Sinnett, M. Poland, P. Segall, T. Orr, H. Zebker, and A. Miklius (2010), Geodetic evidence for en echelon dike emplacement and concurrent slow slip during the June 2007 intrusion and eruption at Kīlauea volcano, Hawaiʻi, J. Geophys. Res., 115(B07405), doi:10.1029/2009JB006658

Swanson, D., K. Wooten, and T. Orr (2009), Buckets of ash track tephra flux from Halemaʻumaʻu Crater, Hawaiʻi: Eos, Transactions, American Geophysical Union, v. 90, no. 46, p. 427.

Wooten, K. M., C. R. Thornber, T. R. Orr, J. F. Ellis, and F. A. Trusdell (2009), Catalog of tephra samples from Kīlauea's summit eruption, March-December 2008: U.S. Geological Survey Open-File Report 2009-1134, 26 p. and database [http://pubs.usgs.gov/of/2009/1134/].

Wilson, D., T. Elias, T. Orr, M. Patrick, A. J. Sutton, and D. Swanson (2008), Small explosion from new vent at Kīlauea’s summit, EOS Trans. AGU, 89(22), 203.

Orr, T. R., and R. P. Hoblitt (2008), A versatile time-lapse camera system developed by the Hawaiian Volcano Observatory for use at Kīlauea Volcano, Hawai'i: U.S. Geological Survey Scientific Investigations Report 2008-5117, 8 p.

Hoblitt, R. P., T. R. Orr, F. Castella, and P. F. Cervelli (2008), Remote-controlled pan, tilt, zoom cameras at Kīlauea and Mauna Loa volcanoes, Hawaiʻi: U.S. Geological Survey Scientific Investigations Report 2008-5129, 14 p.

Poland, M. P., A. Miklius, T. Orr, A. J. Sutton, C. Thornber, and D. Wilson (2008), New episodes of volcanism at Kīlauea Volcano, Hawai‘i, EOS Trans. AGU, 89(5), 37–38.