Mana, S., Furman, T., Turrin, B. D., Feigenson, M. D. & Swisher, C. C. Magmatic activity across the East African North Tanzanian Divergence Zone. J. Geol. Soc. 172, 368 (2015).
Muirhead, J. D. et al. Displaced cratonic mantle concen-trates deep carbon during continental rifting. Nature 582, 67â72 (2020).
Dawson, J. Sodium carbonate lavas from Oldoinyo Lengai, Tanganyika. Nature 195, 1075 (1962).
Dawson, J. B., Keller, J., Nyamweru, C. Historic and recent eruptive activity of Oldoinyo Lengai. In Carbonatite volcanism: Oldoinyo Lengai and the petrogenesis of natrocarbonatites, IAVCEI Proc Volcanol, 4 (eds, Bell K., Keller J.) 4â22 (Springer, 1995).
Sherrod, D. R., Magigita, M. M. & Kwelwa, S. Geologic map of Oldoinyo Lengai (Oldoinyo Lengai) and surroundings, Arusha Region, United Republic of Tanzania. U.S. Geol. Surv. Rep. 65, 2013-1306 (2013).
Keller, J., Klaudius, J., Kervyn, M., Ernst, G. G. J. & Mattsson, H. B. Fundamental changes in the activity of the natrocarbonatite volcano Oldoinyo Lengai, Tanzania. Bull. Volcanol. 72, 893â912 (2010).
Klaudius, J. & Keller, J. Peralkaline silicate lavas at Oldoinyo Lengai, Tanzania. Lithos 91, 173â190 (2006).
Krafft, M. & Keller, J. Temperature measurements in carbonatite lava lakes andflows, Oldoinyo Lengai, Tanzania. Science 245, 168â170 (1989).
Fischer, T. P. et al. Upper-mantle volatile chemistry at Oldoinyo Lengai volcano and the origin of carbonatites. Nature 459, 77â80 (2009).
Roecker, S. et al. Subsurface images of the Eastern Rift, Africa, from the joint inversion of body waves, surface waves and gravity: Investigating the role of fluids in early-stage continental rifting. Geophys. J. Int. 210, 931â950 (2017).
Reiss, M. C., De Siena, L. & Muirhead, J. D. The Interconnected magmatic plumbing system of the Natron rift. Geophys. Res. Lett. 49, e2022GL098922 (2022).
Wauthier, C. & Ho, C. Satellite geodesy unveils a decade of summit subsidence at Ol Doinyo Lengai Volcano, Tanzania. Geophys. Res. Lett. 51, e2023GL107673 (2024).
Tournigand, P.-Y. et al. Remote volcano monitoring using crowd-sourced imagery and Structure-from-Motion photogrammetry: a case study of Oldoinyo Lengaiâs active pit crater since the 2007â08 paroxysm. J. Volcanol. Geothermal Res. 443, https://doi.org/10.1016/j.jvolgeores.2023.107918 (2023).
McNutt S. R. Volcanic tremor. In Encyclopedia of Earth System Science (ed. Nierenberg W. A.) 4 (Academic Press, 1992).
McNutt, S. R. Seismic monitoring and eruption forecasting of volcanoes: a review of the state-of-the-art and case histories. In Monitoring and Mitigation of Volcanic Hazards (ed. Scarpa, T.) 100â146 (Springer, 1996).
Konstantinou, K. I. & Schlindwein, V. Nature, wavefield properties and source mechanism of volcanic tremor: a review. J. Volcanol. Geotherm. Res. 119, 161â187 (2002).
McNutt, S. R. & Roman, D. C. Volcanic seismicity. In: The Encyclopedia of Volcanoes, 1011â1034 (Academic Press, 2015).
Reiss, M. C. et al. Overview of seismo-acoustic tremor at Oldoinyo Lengai, Tanzania: Shallow storage and eruptions of carbonatite melt. J. Volcanol. Geothermal Res. https://doi.org/10.1016/j.jvolgeores.2023.107898 (2023).
Hotovec, A. J., Prejean, S. G., Vidale, J. E. & Gomberg, J. Strongly gliding harmonic tremor during the 2009 eruption of Redoubt volcano. J. Volcanol. Geotherm. Res. 259, 89â99 (2013).
DâAgostino, M. et al. Volcano monitoring and early warning on Mt. Etna, Sicily, based on volcanic tremor: Methods and technical aspects. In Complex Monitoring of Volcanic Activity (ed, Zobin, V. M.) 53â92 (Nova Science Publishers, Inc, 2013).
Chouet, B. A. Long-period volcano seismicity: its source and use in eruption forecasting. Nature 380, 309â316 (1996a).
Matoza, R. & Roman, D. One hundred years of advances in volcano seismology and acoustics. Bull. Volcanol. 84, 86 (2022).
Roman, D. C. Automated detection and characterization of harmonic tremor in continuous seismic data. Geophys. Res. Lett. 44, https://doi.org/10.1002/2017GL073715 (2017).
Chouet, B. A. & Matoza, R. S. A multi-decadal view of seismic methods for detecting precursors of magma movement and eruption. J. Volcano. Geotherm. Res 252, 108â175 (2013).
Chouet B. A. (1996b) New methods and future trends in seismological volcano monitoring. In Monitoring and Mitigation of Volcano Hazards (eds, Scarpa, R. & Tilling R. I.) 23â97 (Springer-Verlag, 1996).
Aki, K., Fehler, M. & Das, S. Source mechanism of volcanic tremor: fluid driven crack models and their application to the 1963 Kilauea eruption. J. Volcano. Geotherm. Res. 2, 259â287 (1977).
Chouet, B. A. Resonance of a fluid-driven crack: radiation properties and implications for the source of long-period events and harmonic tremor. J. Geophys. Res. 93, 4375â4400 (1988).
Lesage, P., Mora, M. M., Alvarado, G. E., Pacheco, J. & Metaxian, J. P. Complex behavior and source model of the tremor at Arenal volcano, Costa Rica. J. Volcano. Geotherm. Res. 157, 49â59 (2006).
Benoit, J. P. & McNutt, S. R. New constraints on source processes of volcanic tremor at Arenal Volcano, Costa Rica, using broadband seismic data. Geophys. Res. Lett. 24, 449â452 (1997).
Julian, B. R. Volcanic tremor: nonlinear excitation by fluid flow. J. Geophys. Res. 99, 11859â11877 (1994).
Schlindwein, V., Wassermann, J. & Scherbaum, F. Spectral analysis of harmonic tremor signals at Mt. Semeru volcano, Indonesia. Geophys. Res. Lett. 22, 1685â1688 (1995).
Hagerty, M. T., Schwartz, S. Y., Garces, M. A. & Protti, M. Analysis of seismic and acoustic observations at Arenal Volcano, Costa Rica, 1995â1997. J. Volcano. Geotherm. Res. 101, 27â65 (2000).
Seydoux, L., Shapiro, N. M., De Rosny, J., Brenguier, F. & Landes, M. Detecting seismic activity with a covariance matrix analysis of data recorded on seismic arrays. Geophys. J. Int. 204, 1430â1442 (2016).
Soubestre, J. et al. Depth migration of seismovolcanic tremor sources below the Klyuchevskoy Volcanic group (Kamchatka) determined from a network-based analysis. Geophys. Res. Lett. 46, 8018â8030 (2019).
Journeau, C. et al. Seismic tremor reveals active trans-crustal magmatic system beneath Kamchatka volcanoes. Sci. Adv. 8, https://doi.org/10.1126/sciadv.abj1571 (2022).
Reiss, M. C., Rümpker, G. SEISVOL – Seismic and Infrasound Networks to study the volcano Oldoinyo Lengai. GFZ Data Services. [Dataset]. https://doi.org/10.14470/4W7564850022 (2020).
Reiss, M. C. et al. The impact of complex volcanic plumbing on the nature of Seismicity in the developing Magmatic Natron Rift, Tanzania. Front. Earth Sci. 8, 609805 (2021).
Weinstein, A., Oliva, S. J., Ebinger, C. J., Roecker, S. & Tiberi, C. Fault magma interactions during early continental rifting: seismicity of the Magadi-Natron-Manyara basins, Africa. Geochem. Geophys. Geosyst. 18, 3662â3686 (2017).
Plasman, M. et al. Lithospheric low-velocity zones associated with a magmatic segment of the Tanzanian Rift, East Africa. Geophys. J. Int. 210, 465â481 (2017).
Biggs, J., Chivers, M. & Hutchinson, M. C. Surface deformation and stress interactions during the 2007â2010 sequence of earthquake, dyke intrusion and eruption in northern Tanzania. Geophys. J. Int. 195, 16â26 (2013).
Daud, N. et al. Elucidating the magma plumbing system of Ol Doinyo Lengai (Natron Rift, Tanzania) Using satellite geodesy and numerical modeling. J. Volcanol. Geothermal Res. 438, https://doi.org/10.1016/j.jvolgeores.2023.107821 (2023).
Liu, K. & Zhao, J. Progressive damage behaviours of triaxially confined rocks under multiple dynamic loads. Rock. Mech. Rock. Eng. 54, 3327â3358 (2021).
Berkesi, M., Bali, E., Bodnar, R. J., Szabó, Ã., & Guzmics, T. Carbonatite and highly peralkaline nephelinite melts from Oldoinyo Lengai Volcano, Tanzania: the role of natrite-normative fluid degassing. Gondwana Res. 85, 76â83 (2020).
Fehler, M. Observations of volcanic tremor at Mount St. Helens Volcano. J. Geophys. Res. 88, 3476â3484 (1983).
Neuberg, J., Baptie, B., Luckett, R. & Stewart, R. Results from the broadband seismic network on Montserrat. Geophys. Res. Lett. 25, 3661â3664 (1998).
Neuberg, J., Luckett, R., Baptie, B. & Olsen, K. Models of tremor and low-frequency earthquake swarms on Montserrat. J. Volcano. Geotherm. Res. 101, 83â104 (2000).
Chouet, B. Excitation of a buried magmatic pipe: a seismic source model for volcanic tremor. J. Geophys. Res. 90, 1881â1893 (1985).
de Moor, M. et al. Volatile-rich silicate melts from Oldoinyo Lengai volcano (Tanzania): implications for carbonatite genesis and eruptive behavior. Earth Planet. Sci. Lett. 361, 379â390 (2012).
Aki, K. & Koyanagi, R. Deep volcanic tremor and magma ascent mechanism under Kilauea, Hawaii. J. Geophys. Res. 86, 7095â7109 (1981).
Yukutake, Y. et al. Harmonic tremor from the deep part of Hakone volcano. Earth Planets Space 74, 144 (2022).
Longpré, M. A. et al. Shifting melt composition linked to volcanic tremor at Cumbre Vieja volcano. Nat. Geosci. 1â9, https://doi.org/10.1038/s41561-024-01623-x (2025).
Coppess, K., Lam, F., & Dunham, E. Volcanic eruption tremor from particle impacts and turbulence using conduit flow models. Seismica, 4, https://doi.org/10.26443/seismica.v4i1.1285 (2025).
Kumagai, H. & Chouet, B. A. The dependence of acoustic properties of a crack on the resonance mode and geometry. Geophys. Res. Lett. 28, 3325â3328 (2001).
Walter, B. F. et al. Fluids associated with carbonatitic magmatism: A critical review and implications for carbonatite magma ascent. Earth Sci. Rev. 215, 103509 (2021).
Bertin, D. et al. High effusion rates of the Cordón Caulle 2011â2012 eruption (Southern Andes) and their relation with the quasi-harmonic tremor. Geophys. Res. Lett. 42, 7054â7063 (2015).
Liang, C., Peng, J., Ampuero, J. P., Shauer, N. & Dai, K. Resonances of fluid-filled cracks with complex geometry and application to very long period (VLP) seismic signals at Mayotte submarine volcano. J. Geophys. Res.Solid Earth 129, e2023JB027844 (2024).
Kumagai, H. Temporal evolution of a magmatic dike system inferred from the complex frequencies of very long period seismic signals. J. Geophys. Res. Solid Earth 111, https://doi.org/10.1029/2005JB003881 (2006).
Jones, R. K. The well-tempered timpani, in search of the missing fundamental. https://wtt.pauken.org/preface. Last accessed on 25th September 2025.
Ramsey, G. P. Percussion Instrument Group. In: The Physics of Music. Undergraduate Lecture Notes in Physics. Springer, https://doi.org/10.1007/978-3-031-53507-9_8 (2024).
Karlstrom, L. & Dunham, E. M. Excitation and resonance of acoustic-gravity waves in a column of stratified, bubbly magma. J. Fluid Mech. 797, 431â470 (2016).
Crozier, J. & Karlstrom, L. Evolving magma temperature and volatile contents over the 2008â2018 summit eruption of KÄ«lauea Volcano. Sci. Adv. 8, eabm4310 (2022).
McQuillan, M. & Karlstrom, L. Fluid resonance in elastic-walled englacial transport networks. J. Glaciol. 67, 999â1012 (2021).
Ferrick, M. G., Qamar, A. & St. Lawrence, W. F. Source mechanism of volcanic tremor. J. Geophys. Res. Solid Earth 87, 8675â8683 (1982).
Balmforth, N. J., Craster, R. V. & Rust, A. C. Instability in flow through elastic conduits and volcanic tremor. J. Fluid Mech. 527, 353â377 (2005).
Soubestre, J. et al. Network-based detection and classification of seismovolcanic tremors: Example from the Klyuchevskoy volcanic group in Kamchatka. J. Geophys. Res.Solid Earth 123, 564â582 (2018).
Albaric, J. et al. Contrasted seismogenic and rheological behaviours from shallow and deep earthquake sequences in the North Tanzanian Divergence, East Africa. J. Afr. Earth Sci. 58, 799â811 (2010).
Stein, S & Wysession, M. An introduction to seismology, earthquakes, and earth structure. (John Wiley & Sons, 2009).
Shearer, P. M. Introduction to seismology. (Cambridge university press, 2019).
Caudron, C. et al. Anatomy of phreatic eruptions. Earth Planets Space 70, 1â14 (2018).
Krischer, L. et al. ObsPy: A bridge for seismology into the scientific Python ecosystem. Comput. Sci. Discov. 8, 014003 (2015).
Vidale, J. E. Complex polarization analysis of particle motion. Bull. Seismol. Soc. Am. 76, 1393â1405 (1986).
Petibon, C. M., Kjarsgaard, B. A., Jenner, G. A. & Jackson, S. E. Phase relationships of a silicate-bearing natrocarbonatite from Oldoinyo Lengai at 20 and 100âMPa. J. Petrol. 39, 2137â2151 (1998).
