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  • economic loss  (1)
  • mass extinction  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Celestial mechanics and dynamical astronomy 69 (1997), S. 31-48 
    ISSN: 1572-9478
    Keywords: cratering ; mass extinction ; periodicities
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Matsumoto & Kubotani argued that there is a positive and statistically significant correlation between cratering and mass extinction. This argument is critically examined by adopting a method of Ertel used by Matsumoto & Kubotani but by applying it more directly to the extinction and cratering records. It is shown that on the null-hypothesis of random distribution of crater ages, the observed correlation has a probability of occurrence of 13%. However, when large craters are excluded whose ages agree with the times of peaks of extinction rate of marine fauna, one obtains a negative correlation. This result strongly indicates that mass extinction are not due to accumulation of impacts but due to isolated gigantic impacts. Further, correlations between cratering and flood basalts and between mass extinction and flood basalts originally recognized by Stothers are further investigated. It is shown that for the former, large craters corresponds to 7 of 11 major flood basalts. Periodicity analyses are carried out for the geomagnetic reversal events and extinction rate peaks recently given by Sepkoski for the interval up to 540 M yr BP. The former exhibits a significant periodicity at P = 15 M yr, but the latter shows no significant period. It seems premature to regard the periodicity in geological records established.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Earth, moon and planets 76 (1997), S. 117-121 
    ISSN: 1573-0794
    Keywords: Asteroid ; tsunami ; economic loss
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Earlier, it was pointed out that asteroids with diameters close to 200 m that hit the Pacific Ocean once in 104 y create large tsunami waves which could cause serious hazards to the cities and countries lying along the periphery. Here, a more detailed investigation is carried out in relation to tsunami hazards created by earthquakes. It is shown that the energy involved in the asteroid induced tsunami wave is some 300 times greater than large tsunami waves and 100 times greater than the Chile tsunami of 1960, the largest this century. Second, if the impact should take place in the Pacific south of Japan, so that the tsunami wave enters Tokyo Bay, the damage could cost 800 billion dollars, which is 6 times greater than the damage due to the Hanshin (Kōbe-Osaka) earthquake of 1995.
    Type of Medium: Electronic Resource
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