-----Messaggio originale-----
Da: John Lahr 
A: psn-l@.............. 
Data: marted=EC 5 ottobre 1999 16.23
Oggetto: Re: Ricther Scale


>Hi David,
>
>The end is still open.  What made you think otherwise?  News accounts
>frequently get this wrong, and say that the Richter scale runs
>from 0 to 10.  Actually very small earthquakes have negative magnitudes.
>The largest recorded so far is the 9.5 Chile earthquake in 1960.
>
>JCLahr
>
>> From: "David Wilson" 
>> When I was young events where measures on the 'Open Ended Ricther Scal=
e".
>>
>> When was the end sealed and has this changed the calibration?
>
>OK Lahr I agree with you that Ricther scale can be negative!
>Regards
Liberio Rossi
l.rossi@..................................................................
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