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70 results for "sonar anomaly" — page 1 of 4
I_3_20 — USO Underwater Base Claims & Evidence
Unidentified Submerged Objects (USOs) — anomalous craft or phenomena observed entering, exiting, or operating beneath bodies of water — represent a distinct subcategory of UAP reports that gained significant official att
ZF_3_04 — USOs: Unidentified Submerged Objects and Trans-Medium Phenomena
Unidentified Submerged Objects (USOs) — anomalous craft or phenomena observed entering, exiting, or operating beneath the ocean surface — represent one of the most intriguing and least explained categories of unidentifie
O_1_13 — South Atlantic Anomaly: Geomagnetic Weakness and Radiation Belt Gap
The South Atlantic Anomaly (SAA) is the largest known weakness in Earth's magnetic field, centered over South America and the South Atlantic Ocean (roughly between Brazil and southern Africa), where the inner Van Allen r
I_2_14 — Historical USO and Naval Encounters with Unidentified Submersible Objects
Unidentified Submersible Objects (USOs) — anomalous objects observed entering, exiting, or operating beneath water — constitute a persistent but poorly documented subset of unidentified aerial phenomena (UAP). Reports sp
ZF_5_02 — Sonar and Acoustic Ocean Sensing: Technology and Discovery
Sonar (SOund NAvigation and Ranging) is the primary technology for sensing the underwater environment — an acoustic analog to radar that exploits the fact that sound travels efficiently through water while electromagneti
ZB_1_07 — Echolocation: Biological Sonar in Bats, Dolphins, and Beyond
Echolocation — the ability to perceive the environment by emitting sounds and analyzing returning echoes — has evolved independently in bats, toothed whales (dolphins, porpoises, sperm whales), some birds (oilbirds, swif
O_1_12 — The Hum: Worldwide Low-Frequency Acoustic Anomaly
"The Hum" refers to a persistent, low-pitched, droning noise perceived by a small but significant percentage of the population (estimated 2–11% depending on the locality and study) in diverse locations worldwide. The Hum
O_3_16 — Underwater Anomaly Catalog
Underwater anomalies range from confirmed submerged archaeological sites (Pavlopetri, Dwarka, Heracleion) to ambiguous geological/archaeological features (Yonaguni, Bimini Road, Baltic Sea Anomaly) to outright unexplaine
I_4_03 — USO Hotspots and Underwater Anomaly Zones
Unidentified Submerged Objects (USOs) — anomalous phenomena observed in or entering/exiting bodies of water — have been reported from specific geographic zones with particular concentration since the 1940s. The Catalina
ZF_4_17 — Anthropogenic Ocean Noise: Acoustic Pollution and Marine Life
Anthropogenic ocean noise — the introduction of human-generated sound into the marine environment — has increased dramatically since the mid-20th century, transforming the ocean soundscape from one dominated by biologica
O_2_21 — Boiling River of the Amazon
The Shanay-timpishka (from the local Asháninka language, meaning "boiled with the heat of the sun") — commonly called the Boiling River — is a 6.24-kilometer-long stretch of the Pachitea River tributary in the Huallaga r
O_2_18 — Ball Lightning and Earthquake Lights: Anomalous Atmospheric Luminosities
Ball lightning and earthquake lights (EQL) represent two of the most enduring unsolved problems in atmospheric and geophysics. Ball lightning — luminous spheres typically 10–50 cm in diameter, persisting for seconds to m
M_5_03 — Piri Reis Map and Cartographic Anomalies
The Piri Reis map is a fragment of a world map drawn on gazelle parchment by the Ottoman admiral and cartographer Piri Reis (Ahmed Muhiddin Piri) in 1513 CE, rediscovered in the Topkapi Palace library, Istanbul, in 1929.
M_5_04 — Submerged Structures of the Mediterranean — Pavlopetri to Baiae
The Mediterranean Sea contains some of the world's best-documented and most archaeologically significant submerged settlements and structures — sites that were built on dry land and subsequently inundated by combinations
M_4_09 — Younger Dryas Impact and Lost Civilization Hypothesis
The Younger Dryas Impact Hypothesis (YDIH) proposes that a cosmic impact or airburst event approximately 12,800 years ago (12.8 ka BP) triggered the Younger Dryas cold reversal — a ~1,300-year return to near-glacial cond
M_2_08 — Underwater Structures of Lake Titicaca & Japan
Multiple significant underwater stone formations have been documented in two distant but thematically related regions: Lake Titicaca (Bolivia/Peru) and the waters surrounding the southern Japanese Ryukyu Islands.
ZF_2_03 — Marine Migration Patterns and Cetacean Intelligence
Marine animals execute some of the most extraordinary navigational feats in biology — humpback whales migrating 8,000+ km between polar feeding grounds and tropical breeding waters, sea turtles returning to their natal b
ZF_3_17 — Anthropogenic Ocean Noise Pollution
Anthropogenic ocean noise — sound from shipping, seismic surveys, military sonar, construction, and industrial activity — has increased ambient ocean sound levels by an estimated 32-fold (15 dB) in many ocean regions sin
ZF_3_11 — The Sargasso Sea, Bermuda Triangle, and Western Atlantic Anomalies
The Sargasso Sea is the only "sea" in the world defined not by coastlines but by ocean currents — a roughly elliptical region (~3.1 million km²) in the western North Atlantic, bounded by the Gulf Stream (west), North Atl
ZF_3_02 — Maritime Archaeology: Shipwrecks, Sunken Cities, and Submerged Structures
Maritime archaeology — the study of human interaction with the sea through material remains — has matured from treasure-hunting salvage into a rigorous scientific discipline that applies the same stratigraphic principles
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