Source: Bolide over Arizona
Location: 33.8N 110.9W
Origin Time: 2016/06/02 ~ 10:56:32 UTC
Description: Broadband infrasound signal with durations up to 11 minutes
IMS Arrays: I57US, I58US, and I59US
UH Arrays: MAKUS
Data Quality: Signal at IMS stations I57US, I59US, and I58US with supporting PMCC results. UH station MAKUS station also had signal in the spectrograms, beam formed results, and PMCC results.
JPL reported that a ~0.49 KT fireball at 10:56:32 UTC (2 June) above Arizona. Expected back azimuths and travel times for several stations were calculated with this information (Table I).
Table I: Approximate arrival times are based on the estimated origin time of 2016/06/02 10:56:32 UTC and a location from http://neo.jpl.nasa.gov/fireballs/.
~Apparent slowness (s/km)
Data analysis is performed with INFERNO and array processing using the Progressive Multi-Channel Correlation (PMCC) method. Signal-to-noise is calculated for each element within the station, in a time window predicted by the origin time, range, and a celerity range of 0.25 to 0.45 km/sec. Hourly, automatic PMCC results are then checked with the event expected time and back-azimuth. Then a beam is constructed with the data along the expected back-azimuth and signal-to-noise is calculated for it. The event is later revisited with a manual PMCC run using optimized parameters.
Several infrasound stations investigated for the Arizona event (Figure 1).
The following figures show the signal captured by IMS stations (I57US, I59US, and I58US) and an UH station (MAKUS). Please note, other stations were processed but were not included in this report due to a lack of significant coherent signal.
Prepared by: ISLA Source: Rock fall into Halemaˋumaˋu lava lake Location: 19.404365° N, 155.280515° W Origin Time: Reported time ~23:21 05/03/2015 UTC IS Arrays: AIND, AHUD, and MENE REDVOX: iPhone6 with iTestMic, unit 1000000007. Data Quality: Good at MENE, some wind noise at AHUD and AIND.
Part of the crater rim wall just below the Halemaˋumaˋu overlook failed and fell into the lava lake around 1:21 PM HT of 3 May 2015. The failure triggered a brief explosive event which was recorded on the HVO/UH infrasound network, as well as an iPhone6 with the REDVOX Infrasound Recorder. The explosion was also captured by several HVO webcams. Continue reading Halemaˋumaˋu Rockfall May 3, 2015→
Prepared by: ISLA Source: Rockfall event at Halema’uma’u Crater Location: 19°24’15.34″N 155°16’49.47″W Origin Time: Reported around 10:00 HST 07/23/2014 IS Array: MENE, UH Infrasound network (data available through IRIS) Data Quality: DQ is less than optimal due to sensor noise issue
A rockfall and “ash event” was reported by the National Park at Hawai’i Volcanoes National Park on 23 July 2014. The event was captured on the summit webcam (figure 1), as well as from the Jagger Museum overlook (figure 2). Continue reading Halma’uma’u Rockfall July 23, 2014→
Unknown Infrasonic Event – XIE140718 Prepared by: ISLA Distribution Date: 18 July 2014 Source: Unknown Location: Keauhou, HI Origin Time: ~4pm HST 07/17/2014 or ~2:00 UTC 07/18/2014 Description: A very large “boom” was reported in the Keauhou area of Kona, along with buildings shaking. IS Array: I59US, KHLU, InfraSound LAborotory (ISLA) test rig “AACE” Data Quality: Good, test rig at ISLA was undergoing high frequency noise test
Summary: A large booming noise was reported in Kona near the Keauhou and Kahalu’u area on 07/17/2014 at around 4pm local time. Witnesses say that buildings shook and car alarms went off. The boom was followed by the sound of jets (reported by several witnesses). This signal was clearly recorded at I59US and set off an automated large amplitude alert at ISLA. Continue reading Unknown Infrasonic Event – XIE140718→
Prepared by: ISLA Distribution Date: 06/13/2014 Source: Volcanic Eruption (Plinian)* Location: Sangeang Api (8.2°S 119.07°E ) Indonesia Origin Time: 140530 ~ 07:56-8:30 UTC [1,2] Description: Telesonic signal below 0.1 Hz IS Array: I39PW (Palau), EOS (Singapore), I04AU, I06AU, I07AU Data Quality: Good in Palau and Australian sites, not so good in Diego Garcia