document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1176634>Question 1176634</A>: <I><SPAN STYLE=\"word-break: break-all;\"> When measuring the intensity of an earthquake, a seismometer is used 100km away from the core of the earthquake. The equation used to determine the magnitude is M=log(A)+3, where A is the recorded trace amplitude (in millimetres) of the quake.\r<BR>\n" );
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document.write( "a) Find the magnitude of an earthquake that records a trace amplitude of 1.5mm.\r<BR>\n" );
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document.write( "b) Find the magnitude of an earthquake that has an amplitude of 10 times the amplitude in part (a). </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #803827 by </B><A HREF=/tutors/aboutme.mpl?userid=Boreal><B>Boreal(15235)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Boreal><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=Boreal><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=803827\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> a. M=log (1.5)+3<BR>\n" );
document.write( "=3.18<BR>\n" );
document.write( "b.M=log(15)+3<BR>\n" );
document.write( "=4.18, which it should be, since a change in magnitude of 1 is 10 x as strong.<BR>\n" );
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