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We always hear about the destruction that the supermoon will bring, but planetary alignments likely only play a very small role in generating earthquakes and eruptions on Earth.
The post It’s Official: The Supermoon Won’t Set Off Earthquakes appeared first on WIRED.
For the first time in 5 years, the alert status has been raised at Hawaii's Mauna Loa.
The post Volcanologists Raise the Alert at Hawaii’s Mauna Loa appeared first on WIRED.
On 18 September JMA reported that an eruption from Asosans Nakadake Crater continued; ash plumes rose 900 m that same day. During an overflight scientists observed that pyroclastic-flow deposits from the 14 September explosion extended down the SE flank as far as 3 km; scientists from Kumamoto University estimated that about 4 million tons of ash were ejected that day. On 21 September an off-white plume rose 900 m. The Alert Level remained at 3 (on a scale of 1-5).
Source: Japan Meteorological Agency (JMA)
On 17 September IG reported that during the previous two weeks activity at Cotopaxi had declined, characterized by a decrease in tremor and less intense gas-and-ash emissions. On 10 September, however, the number of volcano-tectonic events increased. They were mostly located 9-12 km below the summit, although some were as shallow as 4 km. During 19-22 September gas emissions with low ash content rose as high as 1.5 km above the crater and drifted W.
Source: Instituto Geofísico-Escuela Politécnica Nacional (IG)
On 18 September HVO reported that for at least the previous year the seismic network at Mauna Loa detected elevated seismicity beneath the summit, upper Southwest Rift Zone, and W flank; the rate of these shallow earthquakes varied but overall had remained above the long-term average. The earthquakes locations were similar to those preceding recent eruptions in 1975 and 1984, although the magnitudes were comparatively low. In addition, ground deformation consistent with recharge of the volcanos shallow magma storage system was also detected during the previous year. The rate and pattern of the deformation was similar to that measured during a period of inflation 2005, unrest that did not lead to an eruption. However, since the observations indicated that Mauna Loa is no longer at background levels, HVO raised the Aviation Color Code to Yellow and the Volcano Alert Level to Advisory.
Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Servicio Geológico Colombianos (SGC) Observatorio Vulcanológico y Sismológico de Manizales reported that during 15-21 September seismicity at Nevado del Ruiz was characterized by long-period earthquakes and short-duration volcanic tremor associated with gas-and-ash emissions. Increases in seismicity were detected on 15 and 20 September, SW and N of Arenas Crater, respectively; the earthquakes were located at depths between 2.2 and 6.5 km, and were a maximum local M 2. Water-vapor-and-gas plumes rose 2.5 km above the crater and drifted mainly NW, and were sometimes tinged gray due to the presence of ash. Ashfall was reported in Manizales (30 km NW) and Pereira (40 km WSW). The Alert Level remained at III (Yellow; "changes in the behavior of volcanic activity").
Source: Servicio Geológico Colombiano (SGC)
On 14 September OVPDLF reported that during the previous several days seismicity, deformation, and gas emissions at Piton de la Fournaise intensified. Tremor levels fluctuated. The two lava lakes separated by a partition in a single vent remained active. Lava flows emerged from and were active beyond a 50-100 m lava tube; the largest lava flows were not longer than 1.5 km. By 17 September seismic activity, deformation, and gas emissions had stabilized, and only one lava lake was active.
Source: Observatoire Volcanologique du Piton de la Fournaise (OVPDLF)
Based on a pilot observation, the Darwin VAAC reported that on 15 September an ash plume from Batu Tara drifted 185 km NW at an altitude of 1.5 km (5,000 ft) a.s.l.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
INSIVUMEH reported that during 17-19 September white-and-blue fumarolic plumes rose from Pacaya's Mackenney cone and drifted W and S. Tremor was detected and incandescence from the crater was visible at night. Weak explosions on 22 September generated an ash plume that rose 900 m above the crater and drifted W. Tremor continued to be recorded.
Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
CENAPRED reported that during 16-22 September the seismic network at Popocatépetl recorded 15-89 daily emissions consisting of water vapor, gas, and sometimes ash; cloud cover often prevented visual observations. Variable nighttime or morning crater incandescence was observed most days, and 1-13 daily explosions were registered. The Alert Level remained at Yellow, Phase Two.
Source: Centro Nacional de Prevencion de Desastres (CENAPRED)
Based on satellite image analyses and wind data, the Washington VAAC reported that on 19 September possible re-suspended ash from Soufrière Hills drifted WNW at an altitude of 1 km (3,000 ft) a.s.l.
Source: Washington Volcanic Ash Advisory Center (VAAC)
AVO reported that during 16-22 September low-level unrest at Cleveland continued. Weakly elevated surface temperatures were detected in one satellite image during 20-21 September. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch.
Source: US Geological Survey Alaska Volcano Observatory (AVO)
PVMBG reported that during 8-14 September foggy weather sometimes prevented visual observations of Sinabung and the growing lava dome in the summit crater. Lava flows on the flanks were incandescent as far as 2 km ESE. As many as six pyroclastic flows per day were detected, traveling as far as 3.5 km ESE and SE. Ash plumes rose as high as 2.5 km. Seismicity consisted of avalanche signals, low-frequency and hybrid events, tremor, tectonic events, and volcanic earthquakes. Seismicity fluctuated, although it had declined compared to the previous week. Deformation measurements showed deflation. The Alert Level remained at 4 (on a scale of 1-4), indicating that people within 7 km of the volcano on the SSE sector, and within 6 km in the ESE sector, should evacuate. Based on information from PVMBG, the Darwin VAAC reported that on 18 September an ash plume from a pyroclastic flow rose to an altitude of 3.3 km (11,000 ft) a.s.l. On 21 September an ash plume rose to an altitude of 4.3 km (14,000 ft) a.s.l. and drifted SW. Later that day a pilot observed an ash plume drifting 45 km SW at an altitude of 5.8 km (19,000 ft) a.s.l.
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Based on observations conducted at the Karangetang Volcano Observation Post in the village of Salili, PVMBG reported during 9-16 September that lava fountains rose as high as 250 m and lava flows traveled as far as 2.5 km. Incandescent avalanches from the fronts of 150-m-long lava flows traveled as far as 2.5 km E down the Batuawang and Kahetang drainages. Seismicity was dominated by multi-phase earthquakes and signals characteristic of avalanches, with rare volcanic earthquakes. The Alert Level remained at 3 (on a scale of 1-4); visitors and residents were warned not to approach Karangetang within a 4-km radius. Based on analyses of satellite imagery and wind data, the Darwin VAAC reported that during 16-17 September ash plumes rose to altitudes of 2.4-3 km (6,000-10,000 ft) a.s.l. and drifted 30-85 km NE, E, and ESE.
Sources: Darwin Volcanic Ash Advisory Centre (VAAC),Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Instituto Geofísico del Perú (IGP) Observatorio Volcanológico del Sur (OVS) reported that long-period and volcano-tectonic events were at low levels at Ubinas during 15-21 September. Sporadic steam-and-gas plumes rose 600 m. Seismicity (hybrid and long-period events) increased during 20-21 September. An explosion on 21 September at 0914 produced ash plumes that rose 1.7 km and drifted S; ash emission continued until about 0800 the next day. Ashfall was reported in Querapi (4.5 km SE), Ubinas (6.5 km SSE), Tonohaya (7 km SSE), Anascapa (11 km SE), Sacohaya, and San Miguel (10 km SE).
Source: Instituto Geofísico del Perú (IGP)