Skyquake

A skyquake is a phenomenon where a sonic boom sound is reported to originate from the sky. The sound can produce shock waves that vibrate a building or a particular area.
They have been heard in several locations around the world, including the banks of the river Ganges, Marwari village in Himachal Pradesh, the East Coast and inland Finger Lakes of the United States, the Magic Valley in South Central Idaho of the United States, Colombia, Southern Canada, as well as areas of the North Sea, Japan, Australia, Italy, Drogheda, Bettystown, Slane, Dundalk, Ireland, Pune, Ambala, The Netherlands, Norway, Bengaluru, Tierra del Fuego Argentina, United Kingdom, Jakarta and West Java (), Brazil, Uruguay, Tampico, Mexico on , Central Java on (), Bandung of West Java on , and recently, the 6-hour skyquake heard from several cities in East Java (Batu, Malang, and Surabaya) on .
Local names.
Names (according to area) are:
They have been reported from an Adriatic island in 1824; Western Australia, South Australia and Victoria in Australia; Belgium; frequently on calm summer days in the Bay of Fundy, Canada; Lough Neagh in Northern Ireland; Scotland; Passamaquoddy Bay, New Brunswick; Cedar Keys, Florida; Franklinville, New York in 1896; and northern Georgia in the United States.
Their sound has been described as being like distant but inordinately loud thunder while no clouds are in the sky large enough to generate lightning. Those familiar with the sound of cannon fire say the sound is nearly identical. The booms occasionally cause shock waves that rattle plates. Early white settlers in North America were told by the native Haudenosaunee Iroquois that the booms were the sound of the Great Spirit continuing his work of shaping the earth.
The terms "mistpouffers" and "Seneca guns" both originate in Seneca Lake, NY, and refer to the rumble of artillery fire. James Fenimore Cooper, author of "The Last of the Mohicans," wrote "The Lake Gun" in 1850, a short story describing the phenomenon heard at Seneca Lake, which seems to have popularized the terms.
Hypotheses.
Their origin has not been positively identified. They have been explained as: