Science
First Interim Report on Yorusagi Survey: 32 Tagged, Broadly Matching Earlier Estimate
The TDA's biological management division released its first interim report on the 16th in the three-year ecological survey of the Yorusagi, the drift species designated a specified drift species on Aug. 31, as previously reported. Over a month and a half of observation, 32 individuals have been successfully tagged — broadly consistent with the earlier visual estimate of around 40. The division also issued its first penalty under the feeding ban.
Ceramic Fragment Found at Fukagawa Wharf Registered as Provisional Lineage 152
A ceramic fragment found at Fukagawa Wharf earlier this month did not match the isotope ratios of any of the 151 known lineages, and was registered on the 14th as provisional Lineage 152. Its surface bears evenly spaced linear markings, though its purpose remains unknown.
Fukagawa Drift Liquid Found to Shift Viscosity on a 47-Minute Cycle — Academic Presentation Leaves Core Mystery Unsolved
The Third Appraisal Center and Bayocean University gave a joint presentation at an academic conference's autumn meeting on the 10th, on the Fukagawa drift container opened on September 29, previously reported. The centerpiece: continuous measurement has confirmed that the viscosity of the liquid inside shifts in strength on a roughly 47-minute cycle. A possible link to the previously reported phenomenon in which the liquid's surface fails to follow the container's tilt is now suspected, but proof of any causal relationship remains far off, and the underlying cause is still unexplained.
A Small Comb From the Sunamachi Riverbank Becomes Lineage 151
A comb-shaped drift object picked up by a man walking his dog along the Sunamachi riverbank on the morning of the 9th did not match any of the 150 known lineages in isotope ratio and was provisionally registered on the 10th as Lineage 151. Its unevenly spaced teeth make for an unusual shape, and there is as yet no clue to its purpose.
Tentative Lineage 148's Metal Post: The 'How to Count' Is Solved; 'What It Counts' Remains a Mystery
The Third Appraisal Center released an interim report on the 7th on the previously reported decoding of the metal post provisionally registered as Lineage 148, work entrusted to a mathematical analysis team from the Hind Federation. Team lead Anirudh Rao said the symbol sequence had been confirmed to follow a carry-over rule close to base ten, but added that "what the numbers actually count remains completely unknown," leaving the heart of the mystery unresolved.
Fukagawa Drift Object: Partial Scientific Data Released, Including Marking Close-Ups and Isotope Ratios
The No. 3 Appraisal Center released part of the scientific data on the Fukagawa drift container opened on September 29, including close-up images of the markings on its inner surface and isotope-ratio measurements. The possible link to the markings on the tentatively registered Lineage 148 metal post, and the cause of the liquid surface's failure to follow the container's tilt, both remain unexplained.
Fukagawa Drift Container Opened — the Liquid Inside Remains 'Unidentified'
The Third Appraisal Center on the 29th opened one of the three metal containers that washed ashore in Fukagawa 2-chome before dawn on Aug. 21, inside a sealed chamber. As previously reported, the liquid inside behaves like water and its isotope ratio matches no known lineage — the opening did nothing to explain why the liquid's surface fails to track the container's tilt. One new observation did surface: engraving on the container's inner surface bears a 'similar shape' to the symbols on the metal post from the separately reported provisional Lineage 148, though the center stopped short of asserting any connection. Attendance was limited to review-board members, Fukagawa neighborhood-association representatives, and center staff, with no media access.
Fukagawa Drift Container: Final Rehearsal Held Ahead of Tomorrow's Opening
The Third Appraisal Center on the 28th ran a final rehearsal of tomorrow's opening of one of the three Fukagawa drift containers inside a sealed chamber, using no actual container and instead walking through the full sequence — pressure measurement, gas sampling, and emergency shutdown — while confirming the recording equipment's synchronization. The center said it foresaw 'no uncertainty in the procedure' ahead of the 29th, while reiterating that the opening would not necessarily explain why the liquid surface's image fails to track.
Online Theories Revive 'the World Next Door' Claim Over Lineage 122's Child's Shoe — Appraisal Center Holds Its Cautious Line
Online theories claiming a child's shoe found in Sunamachi on September 19 (provisionally Lineage 122) and Lineage 31's 'the world next door' rain boot (found in transit year 40) must belong to the 'same lineage' have flared up again this late September, building on the previously reported observation that their stitching and sole technique nearly match. The No. 3 Appraisal Center on the 27th reiterated its previously reported finding that isotope ratios clearly place the two in separate lineages, maintaining its cautious stance that 'being different lineages alone doesn't explain everything.'
Fukagawa Drift Container Set for Opening on the 29th as the Third Appraisal Center Begins Preparations
The Third Appraisal Center announced on the 25th that it has begun preparations to open one of the three Fukagawa drift containers inside a sealed chamber on Sept. 29, following the quarantine committee's decision on the 16th, previously reported. The chosen vessel is the one where the phenomenon of the liquid surface's image failing to track tilting has been most consistently observed. Preparations began on the 25th with an airtightness test of the chamber and the installation of recording equipment, with a final rehearsal set for the 28th. Officials were careful not to raise expectations too far: 'Opening it doesn't necessarily mean we'll understand its nature right away.' Academic data is expected to be released in early October, after the opening is complete.
23 Years After the Nine-Day Fog, One Tape Goes First — TDA to Report Findings at the Oct. 9 Roll Call
The TDA announced on the 24th that it will bring forward the analysis of a single reel from the 310 magnetic tapes tied to the previously reported Bay Ninefold Fog re-analysis project — a two-year effort with Wanyo University that completed digitization in June — and report findings to the Nine-Day Fog family association at its regular Oct. 9 roll call. Twenty-three years after the event, the effort to approach the fate of the 12 missing from the observation-data side is starting with one reel ahead of the full 310-reel analysis, whose interim report isn't due until next summer. The TDA repeatedly stressed the announcement 'is not meant to raise expectations.'
Tentative Lineage 148's Metal Post: Decoding Formally Entrusted to a Hindic Math Team Under the Joint Study
The Third Appraisal Center announced on the 23rd that decoding the symbols on the metal post that drifted onto a Kameido street on the night of September 1 — provisionally registered as Lineage 148 — has been formally entrusted to a mathematical analysis team from the Hindic Federation, under the framework of the 7th International Joint Study. As previously reported, the symbols were thought to possibly represent a numbering system, but decoding work had gone largely untouched since August.
A Child's Single Shoe Becomes Lineage 122 — Its Craftsmanship Echoes 'the Neighboring World,' Puzzling the Appraisal Center
A single child's shoe found on a Sunamachi street on the night of the 19th did not match any of the 121 known lineages in isotope ratio and was provisionally registered on the 21st as Lineage 122. The Third Appraisal Center says the shoe's stitching and sole construction closely resembles the household items of Lineage 31, previously reported as 'the neighboring world' — the tricycle found in Kameido and others. It marks the first case of a clearly distinct lineage sharing craftsmanship with another, and the Center admits it cannot explain the resemblance by lineage alone.
A Small Bell Becomes Lineage 150 — Found at a Fukagawa Playground
A bell-shaped drift object found at a playground in Fukagawa on the evening of the 17th did not match any of the 149 known lineages in isotope ratio and was provisionally registered on the 18th as Lineage 150 — the first time the world-line matching database has reached three digits. The object was found by an elementary schooler playing in the park and, with no clue yet to its purpose, has been sent to the Third Appraisal Center.
Fukagawa Drift Containers: Review Board Decides to Open Just One, Under Sealed Conditions — the Other Two to Remain in Storage
The Third Appraisal Center's review board decided on the 16th to open only one of the three metal containers that drifted ashore in Fukagawa 2-chome before dawn on Aug. 21 — and to do so under sealed, controlled conditions — while leaving the other two in indefinite storage for now. As previously reported, the liquid surfaces inside the containers still do not follow the container's tilt, and the slight difference in engraved lettering among the three remains unexplained; the opening itself will not take place until around the end of September, to allow time for a cautious approach.
Fukagawa Drift Object: Points Finalized Ahead of the 16th Review Board — 'Indefinite Storage' Now a Formal Agenda Item
Ahead of a Sept. 16 review board on whether to open the Fukagawa drift object, the Third Appraisal Center said it has finalized the points for discussion as of the 13th. It plans to share questions raised at the 12th's resident briefing, previously reported, and the proposal to leave the container sealed in indefinite storage will, for the first time, be treated as a formal agenda item.
120 Residents Attend Fukagawa Drift-Object Briefing; "We Say What We Don't Know" Ahead of the 16th's Review
The Third Appraisal Center held a briefing for local residents on the afternoon of the 12th at a Fukagawa community hall, ahead of the 16th's quarantine committee review of whether to open the drift objects found in Fukagawa 2-chome, previously reported. About 120 people attended. No new analytical findings were announced, but the question-and-answer session ran an hour and a half.
Fukagawa Drift Objects: Resident Briefing Set for the 12th Ahead of the 16th Review
The Third Appraisal Center said on the 9th that it will hold a briefing for the local neighborhood association on the afternoon of the 12th, ahead of the 16th's quarantine committee review on whether to open the drift containers found in Fukagawa. As previously reported, no fault has been found in the measurement or imaging systems used to study the liquid inside; the fluid surface's failure to follow the tilt of the container is believed likely to stem from some property of the substance itself, though the mechanism remains unexplained.
Tentative Lineage 148's Metal Post: Symbols May Be a Numbering System, Still Undeciphered
The Third Appraisal Center said on the 8th that the symbol sequence on the head of the metal post that drifted onto a Kameido sidewalk on the night of September 1 may represent a numbering system rather than a language. The object, provisionally registered as Lineage 148 based on an isotope ratio matching no known lineage, remains of unknown origin.
Spring-Tide Observation Campaign Ends After Three Days; Results Due No Earlier Than Late September
The spring-tide observation campaign that began on September 5 concluded its three-day run on the evening of the 7th. Working along the same stretch of waterfront as the Arrival Remembrance Day ceremony, coordination through a joint field office prevented major disruption. The permeation index stayed largely at "medium" level throughout, and results are not expected before late September at the earliest.
New Theory on the "1975 Question": Researcher Points to a Solar-Wind Disturbance, Field Stays Cautious
At a domestic observation-science conference on the 4th, Associate Professor Saotome Manabu of Tokei Institute of Technology presented a new theory on the long-unsolved "1975 question" — why yuragi began appearing in the 1970s — pointing to a recorded solar-wind disturbance close in timing to the earliest observations. Other researchers responded cautiously, noting correlation is not causation. TDA maintained its standing policy of not commenting on origin theories.
Fukagawa drift object: instruments cleared, opening question goes to Sept. 16 hearing
The joint working group at the Third Appraisal Center reported the results of a re-verification of its measurement and imaging systems to the quarantine committee on the 2nd, concerning a Fukagawa drift object recovered in July. It concluded the instruments were sound, but could not explain why the object's liquid surface fails to follow when the container is tilted. The quarantine committee will decide on September 16 whether to open it.
The Nine-Day Fog's 310 tapes get a stylus again: a 23rd-year re-analysis
The TDA announced on Sept. 1 that it will re-analyze, jointly with Wanyo University, roughly 310 magnetic tapes recorded during the 2003 Bay Ninefold Fog. Digitization completed this year makes it possible for the first time to read second-scale fluctuations beyond the reach of the era's technology. It is the first full-scale attempt to face the fog from the side of the data.
Twenty-four "unrecorded" tremors found on half-century-old chart paper
The Seventh International Joint Research Project on the origins of the Yuragi released its first interim report on Sept. 1. Its re-analysis of early observational records has identified 24 minute fluctuations on chart paper from 1976–79 that fell below the detection thresholds of the era. Separating them from instrument noise remains to be done.
Yorusagi designated a specified drift species: count first, do not cull
The TDA's biological management division formally designated the drift species known as the Yorusagi a specified drift species on Aug. 31, the twelfth such designation. Rather than capture or culling, the framework rests on population management and habitat monitoring, with the first full ecological survey to begin this autumn.
Fukagawa drift object enters opening review; "the liquid does not follow the tilt"
The TDA's quarantine committee began deliberating on Aug. 30 whether to open the drift object recovered in Fukagawa, inside which an image consistent with a liquid has been confirmed. Additional non-destructive testing reported that the liquid surface does not follow the container when the container is tilted. The first session ended without a conclusion.
23 years after the Bay Ninefold Fog: families seek reinvestigation
Ahead of the 23rd anniversary of the Bay Ninefold Fog (2003), the largest permeation event on record, in which twelve people went missing, the families' association petitioned TDA for a reinvestigation on the 29th. TDA responded that it would re-analyze the initial observation records under the framework of an international joint study.
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'The House by the Window' Retrospective — Every Weekend This Month
Ahead of next year's 50th anniversary broadcast. TCT.