document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=429176>Question 429176</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I have no experiences using a logarithm so I need help trying to figure out how this formula works. Any assistance is appreciated.\r<BR>\n" );
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document.write( "Earthquakes The Richter scale is used to determine<BR>\n" );
document.write( "the intensity of earthquakes, which corresponds<BR>\n" );
document.write( "to the amount of energy released. If an earthquake has<BR>\n" );
document.write( "an intensity of x, its magnitude, as computed by the<BR>\n" );
document.write( "Richter scale, is given by R(x)= log  x/i0 ,  where I is<BR>\n" );
document.write( "the intensity of a small, measurable earthquake.<BR>\n" );
document.write( "(a) On July 26, 1963, an earthquake in Yugoslavia<BR>\n" );
document.write( "had a magnitude of 6.0 on the Richter scale, and<BR>\n" );
document.write( "on August 19, 1977, an earthquake in Indonesia<BR>\n" );
document.write( "measured 8.0. Find the intensity x for each of<BR>\n" );
document.write( "these earthquakes if   I0 = 1<BR>\n" );
document.write( "(b) How many times more intense was the Indonesian<BR>\n" );
document.write( "earthquake than the Yugoslavian earthquake? <BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #298158 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=298158\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> If an earthquake has<BR>\n" );
document.write( "an intensity of x, its magnitude, as computed by the<BR>\n" );
document.write( "Richter scale, is given by R(x)= log x/io , where I is<BR>\n" );
document.write( "the intensity of a small, measurable earthquake.<BR>\n" );
document.write( "-------<BR>\n" );
document.write( "(a) On July 26, 1963, an earthquake in Yugoslavia<BR>\n" );
document.write( "had a magnitude of 6.0 on the Richter scale, and<BR>\n" );
document.write( "on August 19, 1977, an earthquake in Indonesia<BR>\n" );
document.write( "measured 8.0. Find the intensity x for each of<BR>\n" );
document.write( "these earthquakes if Io = 1<BR>\n" );
document.write( "Yugo Quake: 6 = log(x/1)<BR>\n" );
document.write( "6 = log(x)<BR>\n" );
document.write( "x = 10^6<BR>\n" );
document.write( "x = 1,000,000<BR>\n" );
document.write( "========================<BR>\n" );
document.write( "Indo Quake: 8 = log(x/1)<BR>\n" );
document.write( "8 = log(x)<BR>\n" );
document.write( "x = 10*8<BR>\n" );
document.write( "x = 100,000,000<BR>\n" );
document.write( "=========================<BR>\n" );
document.write( "(b) How many times more intense was the Indonesian<BR>\n" );
document.write( "earthquake than the Yugoslavian earthquake?<BR>\n" );
document.write( "Ans: A factor of 100<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. \r<BR>\n" );
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document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );