Magma supply rate

The magma supply rate measures the production rate of magma at a volcano. Global magma production rates on Earth are about 20–25 cubic kilometres per year (4.8–6.0 cu mi/a).[1]

Definitions

Magma supply rate is also known as the Armstrong unit, where 1 Armstrong Unit = 1 cubic kilometre per year (32 m3/s).[2] Armstrong unit can also refer to volcanic flux rate per length of arc in discussions of volcanic arcs, in that case km2/year.[3]

Sometimes in discussion of large volcanic systems such as volcanic arcs the volcanic flux rate is normalized to a surface area, similar to Darcy's law in hydrodynamics. It is often easier to measure magma supply rates when they are normalized for an exposed surface area as it is often difficult to delimit an intrusion.[3]

Measurement difficulties

Estimating the volcanic flux rate or magma supply of a volcanic system is inherently difficult for a number of reasons, and different measurements can come to different conclusions about the volcanic flux rate of a given volcanic system. Not all volcanic bodies are equally well exposed, and it is often impossible or difficult to measure magma supply rates exactly. Furthermore, volcanic flux rates often vary over time, with distinct lulls and pulses. Wall rocks may be assimilated by magma or magma may undergo differentiation such as crystallization.[3] Magma contains vesicles and volcanic edifices are often eroded. The sizes of volcanic edifices and plutons are difficult to estimate, especially in intrusions which are mostly buried.[4]

Applications

The magma supply rate is used to infer the behaviour of volcanic systems which erupt periodically, as well as to describe the growth of the continental crust and of deep-seated magmatic bodies such as plutons.[3] Magma output is usually larger in oceanic settings than in continental ones, and basaltic volcanic systems produce more magma than silicic ones.[4]

Table of selected flux rates
Name Rate Timespan Method Reference
Aegina volcanic field 0.0004 cubic kilometres per millennium (9.6×10−5 cu mi/ka) [5]
Altiplano-Puna volcanic complex 1 cubic kilometre per millennium (0.24 cu mi/ka) extrusive, 3–5 cubic kilometres per millennium (0.72–1.20 cu mi/ka) intrusive 10 mya Total volume/Duration [6]
Altiplano-Puna volcanic complex, first pulse 1.5 cubic kilometres per millennium (0.36 cu mi/ka) extrusive, 4.5–8 cubic kilometres per millennium (1.1–1.9 cu mi/ka) intrusive 200 ka Total volume/Duration [6]
Altiplano-Puna volcanic complex, second pulse 4.5 cubic kilometres per millennium (1.1 cu mi/ka) extrusive, 13.5–22.5 cubic kilometres per millennium (3.2–5.4 cu mi/ka) intrusive 600 ka Total volume/Duration [6]
Altiplano-Puna volcanic complex, third pulse 4 cubic kilometres per millennium (0.96 cu mi/ka) extrusive, 12–20 cubic kilometres per millennium (2.9–4.8 cu mi/ka) intrusive 600 ka Total volume/Duration [6]
Altiplano-Puna volcanic complex, fourth pulse 12 cubic kilometres per millennium (2.9 cu mi/ka) extrusive, 36–60 cubic kilometres per millennium (8.6–14.4 cu mi/ka) intrusive 350 ka Total volume/Duration [6]
Altiplano-Puna volcanic complex, after 4th pulse 0.2 cubic kilometres per millennium (0.048 cu mi/ka) extrusive, 0.6–1 cubic kilometre per millennium (0.14–0.24 cu mi/ka) intrusive 2400 ka Total volume/Duration [6]
Arenal 2.7 cubic kilometres per millennium (0.65 cu mi/ka) 7,000 years Total volume/Duration [7]
Aucanquilcha, Angulo 0.015 cubic kilometres per millennium (0.0036 cu mi/ka) 600-200 ka Total volume/Duration [8]
Aucanquilcha, Azufrera 0.16 cubic kilometres per millennium (0.038 cu mi/ka) 1040–920 ka Total volume/Duration [8]
Aucanquilcha, Cumbre Negra 0.005 cubic kilometres per millennium (0.0012 cu mi/ka) Over 150 ka Total volume/Duration [8]
Aucanquilcha, Rodado 0.09 cubic kilometres per millennium (0.022 cu mi/ka) 950–850 ka Total volume/Duration [8]
Aucanquilcha, edifice building phases 0.16 cubic kilometres per millennium (0.038 cu mi/ka) Over 200 ka Total volume/Duration [8]
Aucanquilcha, later phases 0.02 cubic kilometres per millennium (0.0048 cu mi/ka) 800 ka Total volume/Duration [8]
Broken Ridge 1,000–2,000 cubic kilometres per millennium (240–480 cu mi/ka) Between 88-89 million years ago Total volume/Duration [9]
Camargo volcanic field 0.026 cubic kilometres per millennium (0.0062 cu mi/ka) Total volume/Duration [10]
Caribbean large igneous province 2,000 cubic kilometres per millennium (480 cu mi/ka) Between 89-91 million years ago Total volume/Duration [9]
Cascades 300 cubic kilometres per millennium (72 cu mi/ka) A single pluton plumbing system Volume/Duration [3]
Central Volcanic Zone 0.11 cubic kilometres per millennium (0.026 cu mi/ka) Last 28 million years [8]
Cerro Toledo, Jemez Caldera, intrusion 35 cubic kilometres per millennium (8.4 cu mi/ka) Over 0.33 million years Magma supplied/duration [11]
Chimborazo 0.5–0.7 cubic kilometres per millennium (0.12–0.17 cu mi/ka) A single pluton plumbing system Volume/Duration [12]
Chimborazo, Basal Edifice 1–0.7 cubic kilometres per millennium (0.24–0.17 cu mi/ka) 120-60 ka Volume/Duration [12]
Chimborazo, Intermediary Edifice 0.4–0.7 cubic kilometres per millennium (0.096–0.168 cu mi/ka) 60–35 ka Volume/Duration [12]
Chimborazo, Young Cone 0.1 cubic kilometres per millennium (0.024 cu mi/ka) 33–14 ka Volume/Duration [12]
Cook Islands-Austral Islands 11 cubic kilometres per millennium (2.6 cu mi/ka) 25 million years Total volume of edifices/age, neglecting subsidence and eroded material [13]
El Chichon 0.5 cubic kilometres per millennium (0.12 cu mi/ka) Past 8,000 years Volume/Duration [14]
El Hierro >0.4 cubic kilometres per millennium (0.096 cu mi/ka) Juvenile stage Total volume including sector collapses/Duration [15][16]
El Misti 0.63 cubic kilometres per millennium (0.15 cu mi/ka) Last 350 ka Total volume/Duration [15]
Emperor Seamounts 10 cubic kilometres per millennium (2.4 cu mi/ka) 80 to 45 million years ago Volume/Duration [17]
Farallon Negro 0.31 cubic kilometres per millennium (0.074 cu mi/ka) Interpolated volume/Duration [18]
Hawaii 210 cubic kilometres per millennium (50 cu mi/ka) Volume including subsidence/Duration [17]
Hawaiian Islands 95 cubic kilometres per millennium (23 cu mi/ka) 6 to 0 million years ago Volume/Duration [17]
Hawaiian Ridge 17 cubic kilometres per millennium (4.1 cu mi/ka) 45 to 0 million years ago Volume/Duration [17]
Imbabura 0.13 cubic kilometres per millennium (0.031 cu mi/ka) Past 35,000 years Minimum total volume/Duration [19]
Klyuchevskaya Sopka 40 cubic kilometres per millennium (9.6 cu mi/ka) Last 6800 years Total volume/Duration [20]
Lesser Antilles Volcanic Arc 3 cubic kilometres per millennium (0.72 cu mi/ka) Last 100 ka Total volume/Duration [21]
Marquesas Islands 21 cubic kilometres per millennium (5.0 cu mi/ka) 7 million years Total volume of edifices/age, neglecting subsidence and eroded material [13]
Meidob volcanic field, whole edifice 0.2 cubic kilometres per millennium (0.048 cu mi/ka) Between 7 and 0.3 million years ago Total volume/Duration [22]
Menengai 0.52 cubic kilometres per millennium (0.12 cu mi/ka) [23]
Methana 0.001 cubic kilometres per millennium (0.00024 cu mi/ka) [5]
Morne Jacob, whole edifice 0.040 ± 0.008 cubic kilometres per millennium (0.0096 ± 0.0019 cu mi/ka) During, 3.7 ± 0.03 Myr Total volume/Duration [21]
Morne Jacob, J1T 0.107 cubic kilometres per millennium (0.026 cu mi/ka) 5.14 ± 0.07 and 4.10 ± 0.06 Ma Total volume (assuming basis at sea level)/Duration [21][24]
Morne Jacob, J2T 0.02 cubic kilometres per millennium (0.0048 cu mi/ka) Between 3.2 and 1.5 Ma Total volume (subtracting J1T)/Duration [21]
Mount Adams volcanic field 0.1 cubic kilometres per millennium (0.024 cu mi/ka) Postglacial [25]
Mount Etna 1.6 ± 0.4 cubic kilometres per millennium (0.384 ± 0.096 cu mi/ka) 330,000 years Estimated volume/timespan [26]
Mount Etna, Timpe phase 0.84 cubic kilometres per millennium (0.20 cu mi/ka) 110,000 years Estimated volume/timespan [26]
Mount Etna, Valle del Bove phase 2.9 cubic kilometres per millennium (0.70 cu mi/ka) 50,000 years Estimated volume/timespan [26]
Mount Etna, Stratovolcano phase 4.8 cubic kilometres per millennium (1.2 cu mi/ka) 60,000 years Estimated volume/timespan [26]
Mount Etna 700 cubic kilometres per millennium (170 cu mi/ka) Based on the carbon dioxide output [27]
Mount Pelee, Mont Conil Ia 0.04 cubic kilometres per millennium (0.0096 cu mi/ka)±0.01 543±8-189±3 ka Edifice volume/Duration [21]
Mount Pelee, Mont Conil Ib 0.36 cubic kilometres per millennium (0.086 cu mi/ka)±0.09 Edifice volume/Duration [21]
Mount Pelee, Paleo-Pelee 0.26 cubic kilometres per millennium (0.062 cu mi/ka)±0.08 126±2–25 ka Edifice volume/Duration [21]
Mount Pelee, Saint Vincent stage 0.52 cubic kilometres per millennium (0.12 cu mi/ka)±0.20 25–9 ka Edifice volume/Duration [21]
Mount Pelee, longterm 0.13 cubic kilometres per millennium (0.031 cu mi/ka) Edifice volume/Duration [21]
Mount Pelee 0.75 cubic kilometres per millennium (0.18 cu mi/ka) Past 13,500 BP Average eruption volume*Eruptions per lifespan [21]
Mount Sidley 0.2 cubic kilometres per millennium (0.048 cu mi/ka) [28]
Nevado Tres Cruces 0.13 cubic kilometres per millennium (0.031 cu mi/ka) 1.5-0.03 mya Volume/Duration [29]
Parinacota 0.032 cubic kilometres per millennium (0.0077 cu mi/ka) Since Late Pleistocene. Volume/Duration [30]
Parinacota 2.25 cubic kilometres per millennium (0.54 cu mi/ka) Last 8,000 years. Volume/Duration [30]
Parinacota, Young Cone prior to 8.1 ka 10 cubic kilometres per millennium (2.4 cu mi/ka) 1000–2000 years long. [31]
Ruapehu 0.6 cubic kilometres per millennium (0.14 cu mi/ka) 250,000 years Total volume/Lifespan [32]
Ruapehu, Mangawhero formation 0.88 cubic kilometres per millennium (0.21 cu mi/ka) [32]
Ruapehu, Te Herenga formation 0.93 cubic kilometres per millennium (0.22 cu mi/ka) [32]
Ruapehu, Waihianoa formation 0.9 cubic kilometres per millennium (0.22 cu mi/ka) [32]
Ruapehu, Whakapapa formation 0.17 cubic kilometres per millennium (0.041 cu mi/ka) [32]
Samoa 33 cubic kilometres per millennium (7.9 cu mi/ka) 3 million years Total volume of edifices/age, neglecting subsidence and eroded material [13]
San Francisco Mountain 0.2 cubic kilometres per millennium (0.048 cu mi/ka) ≤ 400 ka Total volume/Duration, including landslide removals [33]
San Francisco Mountain, main shield building stage 0.3 cubic kilometres per millennium (0.072 cu mi/ka) ~ 100 ka Total volume/Duration, including landslide removals [33]
San Pedro de Tatara 0.33–0.19 cubic kilometres per millennium (0.079–0.046 cu mi/ka) Total volume/Duration, including glacially eroded volumes [34]
Santa Maria 0.12 cubic kilometres per millennium (0.029 cu mi/ka) 103-35 ka [35]
Santa Maria 0.16 cubic kilometres per millennium (0.038 cu mi/ka) 103 ka – 1902 [35]
Sierra Nevada 9.7 cubic kilometres per millennium (2.3 cu mi/ka) A single pluton plumbing system Volume of plutons/emplacement time [3]
Society Islands 36 cubic kilometres per millennium (8.6 cu mi/ka) 5 million years Total volume of edifices/age, neglecting subsidence and eroded material [13]
Soufrière Hills 0.17 cubic kilometres per millennium (0.041 cu mi/ka) Last 174 ka Total volume/Duration [21]
Stromboli 10–20 cubic kilometres per millennium (2.4–4.8 cu mi/ka) Magma intrusion needed to create the measured sulfur dioxide emissions. [36]
Tancítaro ≤0.19 cubic kilometres per millennium (0.046 cu mi/ka) ≥ 550 ka Total volume/Duration [37]
Tenerife 0.3 cubic kilometres per millennium (0.072 cu mi/ka) Long term average Total volume/Duration [38]
Tenerife, Old Basaltic Series 0.25–0.5 cubic kilometres per millennium (0.060–0.120 cu mi/ka) 8-4 million years ago Estimated volume/Duration [38]
Tenerife, Cañadas I volcano 0.4 cubic kilometres per millennium (0.096 cu mi/ka) 1 million years Estimated volume/Duration [38]
Tenerife, Cañadas II volcano 0.2–0.25 cubic kilometres per millennium (0.048–0.060 cu mi/ka) 0.8 million years Estimated volume/Duration [38]
Tenerife, Cordillera Dorsal 1.5–1.25 cubic kilometres per millennium (0.36–0.30 cu mi/ka) 0.2 million years Estimated volume/Duration [38]
Tenerife, Teide-Pico Viejo 0.75 cubic kilometres per millennium (0.18 cu mi/ka) 0.2 million years Estimated volume/Duration [38]
Tunupa-Huayrana 0.43–0.93 cubic kilometres per millennium (0.10–0.22 cu mi/ka) 240,000–90,000 years [39]
Ubinas 0.17–0.22 cubic kilometres per millennium (0.041–0.053 cu mi/ka) < 376 ka Cone volume/Duration [37][40]
Yellowstone 2 cubic kilometres per millennium (0.48 cu mi/ka) Long term average [41]
gollark: Well, me, though I think it overreaches.
gollark: I mean, having the right to do something and it being a good idea to do it is not the same thing...
gollark: I... do accept that, you realise...
gollark: He had reasons. He also overreacted. They are not mutually exclusive.
gollark: The issue is more like "one person did a bad thing, there was a massive overreaction, and apparently you have no safeguards in place and someone can randomly run around deleting everything".

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