Detection of Accelerating Transient of Aseismic Rock Strain using Precursory Decline in Groundwater Radon
نویسنده
چکیده
منابع مشابه
Taitung earthquakes in Taiwan
Contrary to the normally observed increase in groundwater radon that occurs prior to earthquakes, we have measured anomalous decreases in radon concentration prior to the 2003 MW1⁄4 6.8 Chengkung and 2006 MW1⁄4 6.1 Taitung earthquakes that occurred within a 55 km radius from the Antung D1 monitoring well in eastern Taiwan. The v-shaped pattern of radon anomalies recognized at Antung is valuable...
متن کاملA mechanism for anomalous decline in radon precursory to an earthquake.
Mechanisms for interpreting anomalous decreases in radon in ground water prior to earthquakes are examined with the help of a case study to show that radon potentially is a sensitive tracer of strain changes in the crust preceding an earthquake. The 2003 Chengkung earthquake of magnitude (M) 6.8 on December 10, 2003, was the strongest earthquake near the Chengkung area in eastern Taiwan since 1...
متن کاملAutomated Radon Monitoring at a Hard-rock Site in the Southern California Transverse Ranges
Data are presented from 20 months of near-real-time (three samples per day) radon monitoring at a hard-rock site in the Transverse Ranges of southern California. An annual cycle is evident in the data which is attributed to thermoelastic strains in the vicinity of the borehole site. Between April 1• 1977• and October 31• 1978• there were 11 earthquakes with magnitudes •P.O within 25 km of the m...
متن کامل7 Radon as Earthquake Precursor
Earthquake predictions are based mainly on the observation of precursory phenomena. However, the physical mechanism of earthquakes and precursors is at present poorly understood, because the factors and conditions governing them are so complicated. Methods of prediction based merely on precursory phenomena are therefore purely empirical and involve many practical difficulties. A seismic precurs...
متن کاملRadon Content of Groundwater as an Earthquake Precursor: Evaluation of Worldwide Data and Physical Basis
The properties of a worldwide data set of 91 radon (222Rn) anomalies (the frequency of occurrence, the precursor time interval, and the distribution of peak amplitudes) are correlated with earthquake data such as the respective magnitude and epicentral distance. These anomalies were reported as precursors to earthquakes in the United States, USSR, China, Japan, and Iceland. Although the data se...
متن کامل