china university of mining and technology (beijing) satellite thermal anomalies before the m s 7.1...
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China University of Mining and Technology (Beijing)
Satellite Thermal anomalies before the MSatellite Thermal anomalies before the MSS7.1 7.1
New Zealand Earthquake 2010New Zealand Earthquake 2010
Qin Kai
Wu Lixin
Guo Guangmeng
2011 IGARSS, 27 July 2011 • Vancouver2011 IGARSS, 27 July 2011 • Vancouver
China University of Mining and Technology (Beijing)
Background
Data and result
Physical mechanism
OutlinesOutlines
China University of Mining and Technology (Beijing)
The first report of earthquake thermal anomalies is represented by Gazli earthquake March 19, 1984 (M=7.2).
Thermal IR image of 11.03.1984, one week before the earthquake - At the point of the intersection of the Tamdy-Tokraus and Karatau faults
BackgroundBackground
Satellite Thermal IR anomalies
China University of Mining and Technology (Beijing)
BackgroundBackgroundSource: S. A. Pulinets, D. Ouzounov, (2006), Thermal, atmospheric and ionospheric anomalies around the time of the Colima M7.
8 earthquake of 21 January 2003, Annales Geophysicae (2006) 24: 835 - 849.
Sharp increase in the daytime temperature from the epicenter for the middle of January (about one week before the earthquake).
China University of Mining and Technology (Beijing)
BackgroundBackground Qin Kai 2010: Surface latent heat flux (SLHF) anomaly before the A
pr 14, 2010 MS7.1 Yushu earthquake
China University of Mining and Technology (Beijing)
BackgroundBackground According to the New Zealand GNS Science, a MS 7.1 earthquake happened on the
South Island of New Zealand (43.52°S, 172.17°E) UTC on Sept. 3, 2010. It a result of strike-slip faulting as the Pacific and Australia plates interact in the central South Island.
China University of Mining and Technology (Beijing)
Data and resultData and result
Two thermal parameters:
Skin temperature refers to the temperature of the surface layer of the earth.
SLHF can reflect water and heat exchange between the ground surface and the atmosphere, as a result of the heat absorbed or released by phase transitions (condensation, evaporation or melting) of atmospheric moisture.
China University of Mining and Technology (Beijing)
Data and resultData and result
Both of the two thermal parameters are from NCEP/NCAR assimilation data. it is generated by an analysis technique in which multi-source observations such as land surface, ship, pibal, aircraft, satellite, and other sensors are accumulated into the model state by taking advantage of consistency constraints with the laws of time evolution and physical properties.
China University of Mining and Technology (Beijing)
Data and resultData and result A spot-shaped SLHF anomaly with a high value to the northeast of th
e epicenter on Aug. 1, 2010.
China University of Mining and Technology (Beijing)
Local high-temperature anomalies of 3–6°C had appeared (the geothermal
areas northeast of the epicenter, at the center of the North Island and in the southwestern South Island) on July 31 and Aug. 1, 2010.
Data and resultData and result
China University of Mining and Technology (Beijing)
If the thermal anomaly was only
a meteorological effect ?
Data and resultData and result
China University of Mining and Technology (Beijing)
Observations of the weather stations showed that near the therma
l anomalies area there were just low-speed relatively-stable winds
Data and resultData and result
China University of Mining and Technology (Beijing)
Infrared satellite cloud map of FY-2D satellite showed that the weather conditi
ons were mainly sunny with sporadic haze distributions
Data and resultData and result
China University of Mining and Technology (Beijing)
So, the local thermal anomalies on July 31 and Aug. 1 resulted neither from solar radiation enhancement of the reduced cloud (e.g., cloudy to clear), nor from a warm air mass effects, but rather most likely resulted from underground heat.
Data and resultData and result
中国矿业大学 (北京 ) 3S 与沉陷工程 研究所 www.dgmine.comwww.dgmine.com
Data and resultData and result The N-S displacement components of GPS stations in New Zealand recorded a quas
i-synchronous fluctuation on July 31 and Aug. 1 2010. This is consistent with the time of the thermal anomalies, and reflects tectonic activity enhancement before the earthquake.
中国矿业大学 (北京 ) 3S 与沉陷工程 研究所 www.dgmine.comwww.dgmine.com
Physical mechanismPhysical mechanism New Zealand is located on the tectonic plate boundary between the Australian an
d Pacific plates. The oblique collision of the two plates causes the Pacific Plate to subduct beneath the Australian Plate, which forms a high-temperature and high-pressure zone in the lithosphere.
中国矿业大学 (北京 ) 3S 与沉陷工程 研究所 www.dgmine.comwww.dgmine.com
Physical mechanismPhysical mechanism The subduction process provides sufficient energy for hot material to upwell from
mantle, which leads to abundant geothermal activity such as hot springs and volcanoes.
China University of Mining and Technology (Beijing)
First, the long-term tectonic activity in the interface region between the Pacific and Australian plates was enhanced in the latter period of the seismogenic process, leading to rock expansion and crack propagation in the local subduction zone and hence providing abundant channels for hot material upwelling from the deep crust and mantle.
Second, hot material resulted in the gradual expansion of the region and then caused local temperatures to increase in particular zones, which are connected with subsurface fluids.
Third, the surface temperature increment affected change in the difference between the specific humidity of the ground and the overlying surface air masses, hence resulting in local SLHF increases.
Physical mechanismPhysical mechanism
China University of Mining and Technology (Beijing)
2011 IGARSS, 27 July 2011 • 2011 IGARSS, 27 July 2011 • VancouverVancouver
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