Abstract
Recent analysis of data, recorded on March 8th 2014 at the Comprehensive Nuclear-Test-Ban Treaty Organisation’s hydroacoustic stations off Cape Leeuwin Western Australia, and at Diego Garcia, has led to the development of an inverse model for locating impacting objects on the sea surface. The model employs the phase velocity of acoustic–gravity waves that radiate during the impact, and only considers their propagation in the water layer. Here, we address a significant characteristic of acoustic–gravity waves: the ability to penetrate through the sea-bottom, which modifies the propagation speed and thus the arrival time of signals at the hydrophone station. Therefore, we revisit some signals that are associated with the missing Malaysian Aeroplane MH370, and illustrate the role of sea-bottom elasticity on determining impact locations.
Highlights
Motivated initially by locating the missing Malaysian Aeroplane MH370, ref.[1] studied the radiation of acoustic– gravity waves from impacting objects. ref.[1] presented a technique for locating objects impacting at the sea surface using an inverse approach
We revisit data that was recorded at the Comprehensive Test Ban Treaty Organisation’s (CTBTO) hydrophone stations HA01 and HA08s on March 7th and 8th 2014 between 23:00 and 04:00 UTC, a time window in which MH370 is believed to have crashed in the Southern Indian Ocean
We address two possible impact events that were identified by ref.[1] thats could be associated with MH370: 1. E1: 301.4 ± 0.4°, 1900 ± 200 km from HA01, centred at −23.662°, 96.676°, recorded at 01:34:40 UTC
Summary
Motivated initially by locating the missing Malaysian Aeroplane MH370, ref.[1] studied the radiation of acoustic– gravity waves from impacting objects. ref.[1] presented a technique for locating objects impacting at the sea surface using an inverse approach. It is well established that acoustic–gravity waves can travel in the ocean[2,3,4,5] for long distances[6], yet they can penetrate through the elastic layers such as sea-bottom[7] or ice-sheets[8,9]. The propagation through multiple layers results in different arrival times, or in the context of this work, would modify the calculated location of impacting objects.
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