Magnitude 5+ Earthquakes – Global

5.8 earthquake hits the Flores Sea.

5.7 earthquake hits Taiwan.

5.2 earthquake hits the Nicobar Islands off India.

5.2 earthquake hits the Hindu Kush, Afghanistan.

5.2 earthquake hits Taiwan.

5.1 earthquake hits Kepulauan Talaud, Indonesia.

Storms and Floods

Tropical Storms – Roundup of Tropical Storms:

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In the Eastern Pacific Ocean: Tropical depression 09e (Jimena), located approximately 1101 nm east of Hilo, Hawaii, is tracking northwestward at 06 knots.

Tropical Storm 08e (Hilda), located approximately 991 nm southwest of San Diego, is tracking west-northwestward at 08 knots.

In the northwestern Pacific Ocean: Tropical depression 12w (Twelve), located approximately 263 nm west-northwest of Chichi Jima, is tracking westward at 11 knots.

Tropical storm 13w (Lupit), located approximately 272 nm southwest of Taipei, Taiwan, is tracking northward at 03 knots.

Tropical depression 14w (Miranae), located approximately 18 nm north of Kadena AFB, Okinawa, Japan, is tracking east-northeastward at 07 knots.

Tropical storm 15w (Nida), located approximately 437 nm east-southeast of Yokosuka, Japan, is tracking northward at 10 knots.

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Iran – Flooding has occurred in East and West Azerbaijan provinces, Tehran, Zanjan, Semnan, Qazvin, Kurdistan, Kerman, Mazandaran and Hormozgan from 01 August. Eight people lost their lives: 6 in Qazvin province, 1 in West Azerbaijan province and 1 in Mazandaran. Flooding has damaged roads, bridges and homes. IRCS said it has provided emergency shelter for 85 people.

Sudan – At least 9 people have died and hundreds of homes damaged or destroyed after flooding in Sudan and South Sudan since 24 July 2021. In Sudan, the Blue Nile river has broken its banks in several areas including in Sennar State, where transport has been severely disrupted. In Unity State of neighbouring South Sudan, authorities say at least 7 people have died in floods which submerged several homes in Mayendit County, displacing around 400 families. According to VOA, the floods destroyed infrastructure, houses and the livelihoods of hundreds of people. Nearly 90% of the land in Mayendit is submerged.

India – As of 04 August that flooding has affected 1,225 villages in Shivpuri, Sheopur, Datia, Gwalior, Guna, Bhind and Morena districts. Bridges and roads have been wiped out and teams from Air Force, Army and National and State Disaster Response Forces have been deployed across affected areas to help rescue victims marooned or trapped in flooded areas. About 5,950 people have been moved safely, with a further 1,400 still requiring rescue. Flooding and rainfall has damaged mobile telephone and power infrastructure, and the Gwalior-Guna railway track, which has been closed.


Roundup of Global Volcanic Activity – New Activity for the Week 28 July – 3 August 2021

Dieng Volcanic Complex – Central Java (Indonesia) : PVMBG reported that on 30 July a burst of mud originated from the Siglagah thermal feature (Dieng Volcanic Complex), located on a steep hill, about 1 km NE of the center of Pagerkandang cone. The event caused an audible banging noise and sent a mudflow, 1-3 m thick, 10 m N. Observers that had visited the site in July saw gas emissions rising 10-30 m high and occasionally heard “bursting” noises up to 100 m away. The event was not accompanied by an increase in seismicity.

Great Sitkin – Andreanof Islands (USA) : AVO reported that unrest continued at Great Sitkin during 28 July-3 August. Seismicity remained elevated and a small swarm was recorded during 1-2 August. Elevated surface temperatures and a north-drifting steam plume were identified in satellite images during 27-28 July. Minor steam emissions were visible during 31 July-3 August. The circular lava dome in the crater had grown to 180 m in diameter based on measurements taken using a 3 August satellite image.

Nyiragongo – DR Congo : Goma Volcano Observatory (GVO) reported that a small area of incandescence from the floor of Nyiragongo’s collapsed crater was visible in a 26 July satellite image.

Pagan – Mariana Islands (USA) : Residents reported felt earthquakes and observed minor emissions at Pagan at around 1430 on 29 July.

Savo – Solomon Islands : According to a news source, residents on Savo in the Solomon Islands reported increased seismicity to authorities on 28 July. Two days later a team from the Geological Survey Division (GSD) and the National Disaster Management Office (NDMO) investigated the volcano. They saw steam-and-gas emissions rising from an area in the crater, possibly indicating an active fissure.

Semisopochnoi – Aleutian Islands (USA) : AVO reported that seismicity at Semisopochnoi had increased in recent days. A notable increase at 0200 on 31 July prompted AVO to raise the Aviation Color Code to Orange and the Volcano Alert Level to Watch a few hours later. Additionally, increased infrasound recorded by local stations suggested low-level emissions. Weather clouds obscured satellite views, though a possible sulfur dioxide plume was detected. Steaming was visible in webcam images. Increased seismicity and elevated activity in infrasound data were recorded during 31 July-1 August, and multiple, discrete, energetic explosions were detected during 1-3 August. Weather clouds again obscured satellite views; steaming was visible in webcam views. Beginning at 1015 on 2 August the local networks recorded an explosion and an intense burst of seismic and acoustic tremor that lasted for about 15 minutes. A small ash cloud was visible in satellite images drifting 60 km N at altitudes of 1.5-3 km (5,000-10,000 ft) a.s.l. Ash emissions from the active vent in North Crater were visible in webcam views on the morning of 3 August.

Ulawun – New Britain (Papua New Guinea) : According to the Darwin VAAC, pilots observed ash plumes from Ulawun on 29 July and 3 August rising 3-3.4 km (10,000-11,000 ft) a.s.l. and drifting E and SSE, respectively. Weather clouds prevented satellite confirmation of the emissions.