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List Of Earthquakes In Tonga
This is a list of earthquakes in Tonga: Earthquakes References Sources * {{DEFAULTSORT:Earthquakes In Tonga Tonga Tonga (, ; ), officially the Kingdom of Tonga ( to, Puleʻanga Fakatuʻi ʻo Tonga), is a Polynesian country and archipelago. The country has 171 islands – of which 45 are inhabited. Its total surface area is about , scattered over in ... Earthquakes in Tonga Earthquakes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mercalli Intensity Scale
The Modified Mercalli intensity scale (MM, MMI, or MCS), developed from Giuseppe Mercalli's Mercalli intensity scale of 1902, is a seismic intensity scale used for measuring the intensity of shaking produced by an earthquake. It measures the effects of an earthquake at a given location, distinguished from the earthquake's inherent force or strength as measured by seismic magnitude scales (such as the "" magnitude usually reported for an earthquake). While shaking is caused by the seismic energy released by an earthquake, earthquakes differ in how much of their energy is radiated as seismic waves. Deeper earthquakes also have less interaction with the surface, and their energy is spread out across a larger volume. Shaking intensity is localized, generally diminishing with distance from the earthquake's epicenter, but can be amplified in sedimentary basins and certain kinds of unconsolidated soils. Intensity scales empirically categorize the intensity of shaking based on the effect ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2009 Tonga Undersea Volcanic Eruption
The 2009 Tonga undersea volcanic eruption began on 16 March 2009, near the island of Hunga Tonga, approximately from the Tongan capital of Nukuʻalofa. The volcano is in a highly active volcanic region that represents a portion of the Pacific Ring of Fire. It is estimated that there are up to 36 undersea volcanoes clustered together in the area. Eruption history The initial 16–17 March eruption created an ejecta column (tephra) which sent ash and smoke up to into the atmosphere and an initial inspection reported that the volcano had breached the ocean surface. Authorities suggested at that time that the eruption did not yet pose any threat to the capital's population, and an inspection team was sent out to evaluate the volcano. Between 18–20 March, a number of Surtseyan eruptions sent ash plumes as high as to into the atmosphere, with prevailing winds pushing the ash cloud about east-northeast of the eruption site and widespread and significant haze reported at Vavau ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2006 Tonga Earthquake
The 2006 Tonga earthquake occurred on 4 May at with a moment magnitude of 8.0 and a maximum Mercalli intensity of VII (very strong). One injury occurred and a non-destructive tsunami was observed. Earthquake The National Oceanic and Atmospheric Administration's Pacific Tsunami Warning Center in Hawaii issued a warning 17 minutes after the earthquake for coastal areas around the Pacific. An hour later, the center downgraded the warning to only the region within 600 miles of the epicenter, and an hour after that, it canceled the alert. The earthquake was followed by a pair of large aftershocks the next day. Damage The event caused very limited damage. The previous large earthquake in Tonga, in 1977, was of a lower magnitude but resulted in more severe damage. A likely cause is that the 2006 quake generated other frequencies that only resulted in resonance in small items. In shops, cans and bottles fell from shelves. *The century-old Catholic church in Lapaha had new cracks in th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |