Hydrophone Detections for MH370 Search – July 2016 Progress Report

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[Revised Aug 10, 2016]

Four candidate MH370 search locations are presented, based on the detection of unidentified hydroacoustic events consistent with the expected flight path. These are preliminary results found by searching for impact and late underwater implosion events using multiple hydrophones and new analysis methods.

Read moreHydrophone Detections for MH370 Search – July 2016 Progress Report

A Southern MH370 search location based on underwater implosion

Newly acquired hydrophone recordings have revealed a surprising find. Among the acoustic signals characteristic of Antarctic ice break events, a strong and clear event stands out with a unique signature and location that fits with an underwater implosion. The proposed location is found by triangulation using signals from seven hydrophones at three widely separated listening stations. The very long baselines for triangulation have the potential for high accuracy with calibration, less than the the 4 km depth of the ocean at the site.

Read moreA Southern MH370 search location based on underwater implosion

Eureka! Discovery of an MH370 implosion candidate

Within just days of obtaining the needed hydrophone data for search and triangulation, an exciting match was found for an implosion event. Most of that time was spent focusing on timing around the 7th Arc, and of course following a false lead or two.

The signal arrived at Perth around 0500 GMT, reaching at least seven hydrophones. It is the strongest and clearest acoustic event for several hours.

Read moreEureka! Discovery of an MH370 implosion candidate

A closer look at the LANL report candidate event

After months with no CTBTO access (and other pressing projects) , the acoustic search is back on the front burner.

Using Rottnest hydrophone recordings provided by IMOS, a possible candidate is being examined that may match the LANL report timing.

The LANL study was looking for impact events only, focusing on Leeuwin HA01 hydrophones. The HA08 recordings from Diego Garcia were dismissed due to seismic survey noise. LANL looked at recordings from 00:36:40 to 00:57:05 and analyzed one event in particular that arrived HA01 at 00:51:59 GMT.  The event appeared to be partially masked by an Antarctic ice event at bearing 190.5 degrees. The preamble to that event did not correlate well, and was visually aligned to derive a bearing of 246.9 degrees, which pointed to the far Southern portion of the 7th Arc.

Read moreA closer look at the LANL report candidate event

Stalled by lack of key CTBTO data

While the prospect of detecting implosion events is still good, the investigation has been stalled by lack of access to the CTBTO hydrophone data.

Despite the initial promise of an invitation to access the needed CTBTO data by becoming a contractor, the submitted proposal has been denied. Engineers at CTBTO have confirmed that the data is online and available, but a bureaucratic technicality is preventing access. A CTBTO administrator is requiring that the contract can only be made with an individual “employed by a large organization”. They estimate that it could take months for their legal team to make modifications that would allow data access by an independent contractor.

Read moreStalled by lack of key CTBTO data

Analyzing IMOS hydrophone recordings

Many thanks to researchers at Curtin University for providing a full day of recordings from the three active IMOS hydrophones.

They each recorded for five minutes out of every fifteen. The two Rottnest recorders are staggered so there is a better chance of detecting events. One of the Rottnest hydrophones is nearly in sync with the Scott Reef recorder, allowing triangulation on events along the 7th arc about 20% over time. There are about 300 five minute recordings to be analyzed.

Read moreAnalyzing IMOS hydrophone recordings

Validation of the triangulation calculations

Many thanks to Dr Alec Duncan of Curtin University, who has been very helpful in providing accurate values for the calculations. He has taken the time to customize a program for computing triangulation positions using his own best estimates for parameters, and provided the results. He consulted a tabular atlas for local SOFAR sound speed and … Read more Validation of the triangulation calculations

New 370Location.com name adoption

You may have noticed that your previous invitation link or bookmarks just did a browser redirect. No worries, it’s intentional. The earlier mh370.yepat.com temporary subdomain name might seem flippant, and that was not the intent. This newly registered 370Location.com domain is more appropriate, both during and hopefully after a successful search. Private.370Location.com is a reminder that … Read more New 370Location.com name adoption

Revised RCS hydrophone details improve the MH370 search path accuracy

The IMOS Rottnest Coastal Shelf (RCS) hydrophone in the Perth Canyon has been key to discovering acoustic triangulation details in the CTBTO Cape Leeuwin hydrophone data.  New details have been revealed about RCS. Two hydrophones were retrieved, but the focus has been on the one that detected an event. It was retrieved last year from … Read more Revised RCS hydrophone details improve the MH370 search path accuracy

MH370 Acoustic Analysis for Implosion

[ August 15, 2015 (revised proposal May 25 2016) — by Ed Anderson ]

Searches in the Indian Ocean have continued for Malaysian flight MH370 since its disappearance on March 8, 2014.  Satellite radio communications with the plane in flight have been analyzed in detail, giving a search path tens of kilometers wide on a long arc with a radius of over 5,000 km. The arc is defined by the timing of the seventh and last INMARSAT handshake with the plane.  The  narrowed search area along this “7th arc” remains large, with ship soundings since mid-2014 focusing on about 1,000 km of the arc, centered some 2,000 km WSW of Perth. This area is based on the expected fuel range of the aircraft and estimates of an autopilot flight bearing based on radar, satellite, and cellphone contact signals at the time the flight went missing.

Read moreMH370 Acoustic Analysis for Implosion

MH370 Acoustic Analysis for Implosion with a (retracted) Proposed Search Area

Sept 2, 2015 – While the late implosion scenario still merits investigation, the proposal of a new search area has now been retracted. Please read this update for details.  N.B.: The Scott Reef timing triangulations here were initially miscalculated, causing a false premise for the full analysis. A careful recalculation using the current method finds that … Read more MH370 Acoustic Analysis for Implosion with a (retracted) Proposed Search Area