A more realistic assessment of beach effects of 2880 March 16 asteroid impact tsunami
نویسندگان
چکیده
Eight years ago, some scientists computed for a 1.1-km diameter asteroid (1950 DA) a 0.0 to 0.3 per cent probability for colliding with Earth. Not long after this, a quasi-analytic model for wave propagation was used to describe the dynamics of the tsunami generated by the asteroid impact somewhere at 600 km east of the U.S. coast. Starting from the same initial conditions, our paper resumes the former calculus in the outfit of numerical simulation. To everybody's relief, the catastrophic outcome of the previous computation (beach waves well over 100 m) has been reconsidered and sensible lower values for run-up heights are predicted. Similar to former computation it takes 3 hours for waves to make landfall from Cape Cod to Cape Hatteras. Due to lower topography of the East coast, run-up distances are of the order of 20-30 Km. Key-Words: asteroid impact, Atlantic Ocean, tsunami, numerical modeling, coastal zones, risks
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