LIGO Events and Earth Tide Ripples
LIGO was designed to detect a tiny ripple in Earth's crust caused by a gravitational wave.
There are coincidences between LIGO detections and earth tide events. From this observation, the ripple from an Earth tide is triggering a response in the LIGO system looking for a small signal in the noise, the ripple in the crust from a gravitational wave.
The LIGO system uses templates for 4 event types to detect; they are binary inspiral events. Each report is one of these 4 types.
The reliability of the LIGO system depends on the accuracy of this pattern matching software.
None of these templates has been validated by a test of the actual event.
None of the detections have been confirmed by an actual observation but LIGO continues to report detections without any validation.
The celestial events causing an earth tide in this time period: Full Moon, New Moon, PeriGee, PeriHelion, MJ = Moon-Jupiter alignment.
On 2019-04-23 was an alignment separation of the Moon and Jupiter of only 1 degree, 38 minutes, at the same RA. This is the MJ event.
More than one LIGO event has been detected in the ripples from one earth tide event. There are more LIGO events than earth tide events in the following list.
There are 33 LIGO events associated with 18 earth tide events.
This list has the LIGO events in chronological order but preceded by the associated earth tide event. LIGO events can be reported before or after the earth tide event whose effect is over a span of time.
The lines starting with GW or S are the LIGO events.
GW150914 _ event 1 day after NM
GW151012 _ same day as NM
GW151226 _ 1 day after FM
GW170104 _ same day as PH
GW170608 _ 1 day before FM
GW170729 _ 6 days after NM
GW170809 _ 2 days after FM
PG-17-08-18 _ resulted in 3 LIGO events
GW170814 _ 4 days before PG
GW170817 _ 1 day before PG
GW170818 _ same day as PG
GW170823 _ 2 days after NM
S190408 _ 3 days ater NM
S190412 _ 4 days before PG
GW170608 _ 1 day before FM
MJ-19-04-23_ resulted in 3 LIGO events
S190421 _ 2 days before MJ
S190425 _ 2 days after MJ
S190426c _ 3 days after MJ
NM-19-05-04 _ resulted in 2 LIGO events
S190503bf _ 1 day before NM
S190510g _ 6 days after NM
FM-19-05-18 _ resulted in 6 LIGO events
S190512at _ 6 days before FM
S190513bm _ 5 days before FM
S190517h _ 1 day before FM
S190519bj _ 1 day after FM
S190521g _ 3 days after FM
S190521r _ 3 days after FM
S190602aq _ 1 day before NM
NM-19-07-02 _ resulted in 4 LIGO events
S190630ag _ 2 days before NM
S190701br _ 1 day before NM
S190706ai _ 4 days after NM
S190707q _ 5 days after NM
S190720a _ 2 days after FM
S190727h _ 4 days before NM
S190728q _ 3 days before NM
S190814bv _ same day as FM
Earth tide is the displacement of the solid earth's surface caused by the gravity of the Moon and Sun. Its main component has meter-level amplitude at periods of about 12 hours and longer.
A new moon or full moon cause a significant earth tide with the Sun also aligned. A perigee does an earth tide regardless of the Sun.
Many of the LIGO events were just a day or two before or after the earth tide event.
All 33 LIGO events were within 6 days of an earth tide event.
For those questioning whether LIGO really detects a ripple in spacetime, this observation suggests the LIGO system detects the ripples of an earth tide.
Each search method produces a list of candidate events which are ranked in terms of their signal strength with respect to the detector's noise — a quantity called the "signal-to-noise-ratio" (SNR) — and their statistical significance, quantified by the false alarm rate (FAR), i.e. the rate at which one might expect such a candidate event to have occurred by chance, due simply to the noise characteristics of the detector data mimicking an actual gravitational-wave detection. By setting a FAR threshold of less than 1 per 30 days (about 12.2 per year) in at least one of the two matched-filter analysis algorithms, we restricted the list of candidate events and eliminated many candidate signals that are very likely to have been simply artefacts of the detector noise: within these candidates we found 11 events with a probability larger than 50% of having an astrophysical origin, rather than being instrumental noise. These candidates are labeled with the prefix 'GW' followed by the date of the detection (i.e. GW150914). The other candidates are considered as 'marginal' events, unlikely to be of astrophysical origin.
another definition from wikipedia:
In signal processing, a matched filter is obtained by correlating a known delayed signal, or template, with an unknown signal to detect the presence of the template in the unknown signal.
There are 11 GW events (with a higher probability of a match) in the LIGO list of 33. 22 are marginal.
This post is a different presentation of the same data of LIGO events and earth tide events.
Perhaps this presentation is more useful.
LIGO needs independent confirmation for credibility.
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