<?xml version='1.0' encoding='utf-8'?>
<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:contributor>Allison L. Bent</dc:contributor>
  <dc:contributor>Daniel E. McNamara</dc:contributor>
  <dc:contributor>Stephen Crane</dc:contributor>
  <dc:contributor>Michal Kolaj</dc:contributor>
  <dc:creator>H.K. Claire Perry</dc:creator>
  <dc:date>2020</dc:date>
  <dc:description>&lt;p&gt;&lt;span&gt;This article assesses the ability of regionally specific, frequency‐dependent crustal attenuation (&lt;/span&gt;&lt;span class="inline-formula no-formula-id"&gt;⁠&lt;span id="MathJax-Element-1-Frame" class="MathJax" data-mathml="&lt;math xmlns=&amp;quot;http://www.w3.org/1998/Math/MathML&amp;quot;&gt;&lt;mn xmlns=&amp;quot;&amp;quot;&gt;1&lt;/mn&gt;&lt;mo xmlns=&amp;quot;&amp;quot;&gt;/&lt;/mo&gt;&lt;mi xmlns=&amp;quot;&amp;quot; mathvariant=&amp;quot;normal&amp;quot;&gt;Q&lt;/mi&gt;&lt;/math&gt;"&gt;&lt;span id="MathJax-Span-1" class="math"&gt;&lt;span&gt;&lt;span id="MathJax-Span-2" class="mrow"&gt;&lt;span id="MathJax-Span-3" class="mn"&gt;1&lt;/span&gt;&lt;span id="MathJax-Span-4" class="mo"&gt;/&lt;/span&gt;&lt;span id="MathJax-Span-5" class="mi"&gt;Q&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;⁠&lt;/span&gt;&lt;span&gt;) to reduce mean magnitude discrepancies between seismic stations in the northern Appalachian and Grenville provinces (NAP and GP) of Canada.&amp;nbsp;&lt;/span&gt;&lt;i&gt;Lg&lt;/i&gt;&lt;span class="inline-formula no-formula-id"&gt;&lt;span id="MathJax-Element-2-Frame" class="MathJax" data-mathml="&lt;math xmlns=&amp;quot;http://www.w3.org/1998/Math/MathML&amp;quot;&gt;&lt;mi xmlns=&amp;quot;&amp;quot;&gt;Q&lt;/mi&gt;&lt;mo xmlns=&amp;quot;&amp;quot; stretchy=&amp;quot;false&amp;quot;&gt;(&lt;/mo&gt;&lt;mi xmlns=&amp;quot;&amp;quot;&gt;f&lt;/mi&gt;&lt;mo xmlns=&amp;quot;&amp;quot; stretchy=&amp;quot;false&amp;quot;&gt;)&lt;/mo&gt;&lt;/math&gt;"&gt;&lt;span id="MathJax-Span-6" class="math"&gt;&lt;span&gt;&lt;span id="MathJax-Span-7" class="mrow"&gt;&lt;span id="MathJax-Span-8" class="mi"&gt;Q&lt;/span&gt;&lt;span id="MathJax-Span-9" class="mo"&gt;(&lt;/span&gt;&lt;span id="MathJax-Span-10" class="mi"&gt;f&lt;/span&gt;&lt;span id="MathJax-Span-11" class="mo"&gt;)&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span&gt;&amp;nbsp;is an important parameter in ground‐motion models used in probabilistic seismic hazard analysis. Discrepancies in regional magnitude estimates have long been noted to exist between stations in the two provinces for common event origins. Such discrepancies could arise from systematic site condition variations between the geologic provinces or from varying crustal attenuative properties. To evaluate the effect of frequency‐dependent anelastic attenuation,&amp;nbsp;&lt;/span&gt;&lt;i&gt;Lg&lt;/i&gt;&lt;span class="inline-formula no-formula-id"&gt;&lt;span id="MathJax-Element-3-Frame" class="MathJax" data-mathml="&lt;math xmlns=&amp;quot;http://www.w3.org/1998/Math/MathML&amp;quot;&gt;&lt;mi xmlns=&amp;quot;&amp;quot;&gt;Q&lt;/mi&gt;&lt;mo xmlns=&amp;quot;&amp;quot; stretchy=&amp;quot;false&amp;quot;&gt;(&lt;/mo&gt;&lt;mi xmlns=&amp;quot;&amp;quot;&gt;f&lt;/mi&gt;&lt;mo xmlns=&amp;quot;&amp;quot; stretchy=&amp;quot;false&amp;quot;&gt;)&lt;/mo&gt;&lt;/math&gt;"&gt;&lt;span id="MathJax-Span-12" class="math"&gt;&lt;span&gt;&lt;span id="MathJax-Span-13" class="mrow"&gt;&lt;span id="MathJax-Span-14" class="mi"&gt;Q&lt;/span&gt;&lt;span id="MathJax-Span-15" class="mo"&gt;(&lt;/span&gt;&lt;span id="MathJax-Span-16" class="mi"&gt;f&lt;/span&gt;&lt;span id="MathJax-Span-17" class="mo"&gt;)&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span&gt;&amp;nbsp;on estimated magnitudes, we analyze&amp;nbsp;&lt;/span&gt;&lt;i&gt;Lg&lt;/i&gt;&lt;span&gt;&amp;nbsp;amplitudes from&amp;nbsp;&lt;/span&gt;&lt;span class="inline-formula no-formula-id"&gt;&lt;span id="MathJax-Element-4-Frame" class="MathJax" data-mathml="&lt;math xmlns=&amp;quot;http://www.w3.org/1998/Math/MathML&amp;quot;&gt;&lt;mo xmlns=&amp;quot;&amp;quot; form=&amp;quot;prefix&amp;quot;&gt;&amp;amp;gt;&lt;/mo&gt;&lt;mn xmlns=&amp;quot;&amp;quot;&gt;6000&lt;/mn&gt;&lt;/math&gt;"&gt;&lt;span id="MathJax-Span-18" class="math"&gt;&lt;span&gt;&lt;span id="MathJax-Span-19" class="mrow"&gt;&lt;span id="MathJax-Span-20" class="mo"&gt;&amp;gt;&lt;/span&gt;&lt;span id="MathJax-Span-21" class="mn"&gt;6000&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span&gt;&amp;nbsp;waveforms recorded by Grenville and northern Appalachian receivers from 420 natural earthquakes of&amp;nbsp;&lt;/span&gt;&lt;span class="inline-formula no-formula-id"&gt;&lt;span id="MathJax-Element-5-Frame" class="MathJax" data-mathml="&lt;math xmlns=&amp;quot;http://www.w3.org/1998/Math/MathML&amp;quot;&gt;&lt;msub xmlns=&amp;quot;&amp;quot;&gt;&lt;mi&gt;M&lt;/mi&gt;&lt;mi mathvariant=&amp;quot;normal&amp;quot;&gt;N&lt;/mi&gt;&lt;/msub&gt;&lt;/math&gt;"&gt;&lt;span id="MathJax-Span-22" class="math"&gt;&lt;span&gt;&lt;span id="MathJax-Span-23" class="mrow"&gt;&lt;span id="MathJax-Span-24" class="msub"&gt;&lt;span id="MathJax-Span-25" class="mi"&gt;M&lt;/span&gt;&lt;span id="MathJax-Span-26" class="mi"&gt;N&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span&gt;&amp;nbsp;magnitude 3–5.6. Waveform analysis is strictly limited to analyst‐reviewed, vertical‐component waveforms in which&amp;nbsp;&lt;/span&gt;&lt;i&gt;Lg&lt;/i&gt;&lt;span&gt;&amp;nbsp;is clearly identified, ensuring that the datasets exhibit dominant, high‐frequency energy in the&amp;nbsp;&lt;/span&gt;&lt;i&gt;Lg&lt;/i&gt;&lt;span&gt;&amp;nbsp;velocity window.&amp;nbsp;&lt;/span&gt;&lt;i&gt;Lg&lt;/i&gt;&lt;span class="inline-formula no-formula-id"&gt;&lt;span id="MathJax-Element-6-Frame" class="MathJax" data-mathml="&lt;math xmlns=&amp;quot;http://www.w3.org/1998/Math/MathML&amp;quot;&gt;&lt;mi xmlns=&amp;quot;&amp;quot;&gt;Q&lt;/mi&gt;&lt;mo xmlns=&amp;quot;&amp;quot; stretchy=&amp;quot;false&amp;quot;&gt;(&lt;/mo&gt;&lt;mi xmlns=&amp;quot;&amp;quot;&gt;f&lt;/mi&gt;&lt;mo xmlns=&amp;quot;&amp;quot; stretchy=&amp;quot;false&amp;quot;&gt;)&lt;/mo&gt;&lt;/math&gt;"&gt;&lt;span id="MathJax-Span-27" class="math"&gt;&lt;span&gt;&lt;span id="MathJax-Span-28" class="mrow"&gt;&lt;span id="MathJax-Span-29" class="mi"&gt;Q&lt;/span&gt;&lt;span id="MathJax-Span-30" class="mo"&gt;(&lt;/span&gt;&lt;span id="MathJax-Span-31" class="mi"&gt;f&lt;/span&gt;&lt;span id="MathJax-Span-32" class="mo"&gt;)&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span&gt;&amp;nbsp;is found to be higher in the GP than in the northern Appalachians. In the Grenville,&amp;nbsp;&lt;/span&gt;&lt;span class="inline-formula no-formula-id"&gt;&lt;span id="MathJax-Element-7-Frame" class="MathJax" data-mathml="&lt;math xmlns=&amp;quot;http://www.w3.org/1998/Math/MathML&amp;quot;&gt;&lt;mi xmlns=&amp;quot;&amp;quot;&gt;Q&lt;/mi&gt;&lt;mo xmlns=&amp;quot;&amp;quot; stretchy=&amp;quot;false&amp;quot;&gt;(&lt;/mo&gt;&lt;mi xmlns=&amp;quot;&amp;quot;&gt;f&lt;/mi&gt;&lt;mo xmlns=&amp;quot;&amp;quot; stretchy=&amp;quot;false&amp;quot;&gt;)&lt;/mo&gt;&lt;mo xmlns=&amp;quot;&amp;quot;&gt;=&lt;/mo&gt;&lt;mn xmlns=&amp;quot;&amp;quot;&gt;761&lt;/mn&gt;&lt;mo xmlns=&amp;quot;&amp;quot; stretchy=&amp;quot;false&amp;quot;&gt;(&lt;/mo&gt;&lt;mo xmlns=&amp;quot;&amp;quot;&gt;&amp;amp;#xB1;&lt;/mo&gt;&lt;mn xmlns=&amp;quot;&amp;quot;&gt;145&lt;/mn&gt;&lt;mo xmlns=&amp;quot;&amp;quot; stretchy=&amp;quot;false&amp;quot;&gt;)&lt;/mo&gt;&lt;msup xmlns=&amp;quot;&amp;quot;&gt;&lt;mi&gt;f&lt;/mi&gt;&lt;mrow&gt;&lt;mn&gt;0.25&lt;/mn&gt;&lt;mo stretchy=&amp;quot;false&amp;quot;&gt;(&lt;/mo&gt;&lt;mo&gt;&amp;amp;#xB1;&lt;/mo&gt;&lt;mn&gt;0.014&lt;/mn&gt;&lt;mo stretchy=&amp;quot;false&amp;quot;&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;/math&gt;"&gt;&lt;span id="MathJax-Span-33" class="math"&gt;&lt;span&gt;&lt;span id="MathJax-Span-34" class="mrow"&gt;&lt;span id="MathJax-Span-35" class="mi"&gt;Q&lt;/span&gt;&lt;span id="MathJax-Span-36" class="mo"&gt;(&lt;/span&gt;&lt;span id="MathJax-Span-37" class="mi"&gt;f&lt;/span&gt;&lt;span id="MathJax-Span-38" class="mo"&gt;)&lt;/span&gt;&lt;span id="MathJax-Span-39" class="mo"&gt;=&lt;/span&gt;&lt;span id="MathJax-Span-40" class="mn"&gt;761&lt;/span&gt;&lt;span id="MathJax-Span-41" class="mo"&gt;(&lt;/span&gt;&lt;span id="MathJax-Span-42" class="mo"&gt;±&lt;/span&gt;&lt;span id="MathJax-Span-43" class="mn"&gt;145&lt;/span&gt;&lt;span id="MathJax-Span-44" class="mo"&gt;)&lt;/span&gt;&lt;span id="MathJax-Span-45" class="msup"&gt;&lt;span id="MathJax-Span-46" class="mi"&gt;f&lt;/span&gt;&lt;span id="MathJax-Span-47" class="mrow"&gt;&lt;sup&gt;&lt;span id="MathJax-Span-48" class="mn"&gt;0.25&lt;/span&gt;&lt;span id="MathJax-Span-49" class="mo"&gt;(&lt;/span&gt;&lt;span id="MathJax-Span-50" class="mo"&gt;±&lt;/span&gt;&lt;span id="MathJax-Span-51" class="mn"&gt;0.014&lt;/span&gt;&lt;span id="MathJax-Span-52" class="mo"&gt;)&lt;/span&gt;&lt;/sup&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;⁠&lt;/span&gt;&lt;span&gt;, and in the northern Appalachians, attenuation is higher:&amp;nbsp;&lt;/span&gt;&lt;span class="inline-formula no-formula-id"&gt;&lt;span id="MathJax-Element-8-Frame" class="MathJax" data-mathml="&lt;math xmlns=&amp;quot;http://www.w3.org/1998/Math/MathML&amp;quot;&gt;&lt;mi xmlns=&amp;quot;&amp;quot;&gt;Q&lt;/mi&gt;&lt;mo xmlns=&amp;quot;&amp;quot; stretchy=&amp;quot;false&amp;quot;&gt;(&lt;/mo&gt;&lt;mi xmlns=&amp;quot;&amp;quot;&gt;f&lt;/mi&gt;&lt;mo xmlns=&amp;quot;&amp;quot; stretchy=&amp;quot;false&amp;quot;&gt;)&lt;/mo&gt;&lt;mo xmlns=&amp;quot;&amp;quot;&gt;=&lt;/mo&gt;&lt;mn xmlns=&amp;quot;&amp;quot;&gt;506&lt;/mn&gt;&lt;mo xmlns=&amp;quot;&amp;quot; stretchy=&amp;quot;false&amp;quot;&gt;(&lt;/mo&gt;&lt;mo xmlns=&amp;quot;&amp;quot;&gt;&amp;amp;#xB1;&lt;/mo&gt;&lt;mn xmlns=&amp;quot;&amp;quot;&gt;172&lt;/mn&gt;&lt;mo xmlns=&amp;quot;&amp;quot; stretchy=&amp;quot;false&amp;quot;&gt;)&lt;/mo&gt;&lt;msup xmlns=&amp;quot;&amp;quot;&gt;&lt;mi&gt;f&lt;/mi&gt;&lt;mrow&gt;&lt;mn&gt;0.33&lt;/mn&gt;&lt;mo stretchy=&amp;quot;false&amp;quot;&gt;(&lt;/mo&gt;&lt;mo&gt;&amp;amp;#xB1;&lt;/mo&gt;&lt;mn&gt;0.310&lt;/mn&gt;&lt;mo stretchy=&amp;quot;false&amp;quot;&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;/math&gt;"&gt;&lt;span id="MathJax-Span-53" class="math"&gt;&lt;span&gt;&lt;span id="MathJax-Span-54" class="mrow"&gt;&lt;span id="MathJax-Span-55" class="mi"&gt;Q&lt;/span&gt;&lt;span id="MathJax-Span-56" class="mo"&gt;(&lt;/span&gt;&lt;span id="MathJax-Span-57" class="mi"&gt;f&lt;/span&gt;&lt;span id="MathJax-Span-58" class="mo"&gt;)&lt;/span&gt;&lt;span id="MathJax-Span-59" class="mo"&gt;=&lt;/span&gt;&lt;span id="MathJax-Span-60" class="mn"&gt;506&lt;/span&gt;&lt;span id="MathJax-Span-61" class="mo"&gt;(&lt;/span&gt;&lt;span id="MathJax-Span-62" class="mo"&gt;±&lt;/span&gt;&lt;span id="MathJax-Span-63" class="mn"&gt;172&lt;/span&gt;&lt;span id="MathJax-Span-64" class="mo"&gt;)&lt;/span&gt;&lt;span id="MathJax-Span-65" class="msup"&gt;&lt;span id="MathJax-Span-66" class="mi"&gt;f&lt;/span&gt;&lt;sup&gt;&lt;span id="MathJax-Span-67" class="mrow"&gt;&lt;span id="MathJax-Span-68" class="mn"&gt;0.33&lt;/span&gt;&lt;span id="MathJax-Span-69" class="mo"&gt;(&lt;/span&gt;&lt;span id="MathJax-Span-70" class="mo"&gt;±&lt;/span&gt;&lt;span id="MathJax-Span-71" class="mn"&gt;0.310&lt;/span&gt;&lt;span id="MathJax-Span-72" class="mo"&gt;)&lt;/span&gt;&lt;/span&gt;&lt;/sup&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span&gt;. Earthquake magnitude determined using the peak amplitude of the&amp;nbsp;&lt;/span&gt;&lt;i&gt;Lg&lt;/i&gt;&lt;span&gt;&amp;nbsp;phase (&lt;/span&gt;&lt;span class="inline-formula no-formula-id"&gt;⁠&lt;span id="MathJax-Element-9-Frame" class="MathJax" data-mathml="&lt;math xmlns=&amp;quot;http://www.w3.org/1998/Math/MathML&amp;quot;&gt;&lt;msub xmlns=&amp;quot;&amp;quot;&gt;&lt;mi&gt;m&lt;/mi&gt;&lt;mrow&gt;&lt;mi mathvariant=&amp;quot;normal&amp;quot;&gt;b&lt;/mi&gt;&lt;mi&gt;L&lt;/mi&gt;&lt;mi&gt;g&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;"&gt;&lt;span id="MathJax-Span-73" class="math"&gt;&lt;span&gt;&lt;span id="MathJax-Span-74" class="mrow"&gt;&lt;span id="MathJax-Span-75" class="msub"&gt;&lt;i&gt;&lt;span id="MathJax-Span-76" class="mi"&gt;m&lt;/span&gt;&lt;/i&gt;&lt;sub&gt;&lt;span id="MathJax-Span-77" class="mrow"&gt;&lt;span id="MathJax-Span-78" class="mi"&gt;b&lt;/span&gt;&lt;span id="MathJax-Span-79" class="mi"&gt;L&lt;/span&gt;&lt;span id="MathJax-Span-80" class="mi"&gt;g&lt;/span&gt;&lt;/span&gt;&lt;/sub&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span&gt;) for eastern Canada is corrected to incorporate the frequency‐dependent, regionally specific&amp;nbsp;&lt;/span&gt;&lt;i&gt;Lg&lt;/i&gt;&lt;span class="inline-formula no-formula-id"&gt;&lt;span id="MathJax-Element-10-Frame" class="MathJax" data-mathml="&lt;math xmlns=&amp;quot;http://www.w3.org/1998/Math/MathML&amp;quot;&gt;&lt;mi xmlns=&amp;quot;&amp;quot;&gt;Q&lt;/mi&gt;&lt;mo xmlns=&amp;quot;&amp;quot; stretchy=&amp;quot;false&amp;quot;&gt;(&lt;/mo&gt;&lt;mi xmlns=&amp;quot;&amp;quot;&gt;f&lt;/mi&gt;&lt;mo xmlns=&amp;quot;&amp;quot; stretchy=&amp;quot;false&amp;quot;&gt;)&lt;/mo&gt;&lt;/math&gt;"&gt;&lt;span id="MathJax-Span-81" class="math"&gt;&lt;span&gt;&lt;span id="MathJax-Span-82" class="mrow"&gt;&lt;span id="MathJax-Span-83" class="mi"&gt;Q&lt;/span&gt;&lt;span id="MathJax-Span-84" class="mo"&gt;(&lt;/span&gt;&lt;span id="MathJax-Span-85" class="mi"&gt;f&lt;/span&gt;&lt;span id="MathJax-Span-86" class="mo"&gt;)&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span&gt;&amp;nbsp;determined in this study. Using the new&amp;nbsp;&lt;/span&gt;&lt;i&gt;Lg&lt;/i&gt;&lt;span class="inline-formula no-formula-id"&gt;&lt;span id="MathJax-Element-11-Frame" class="MathJax" data-mathml="&lt;math xmlns=&amp;quot;http://www.w3.org/1998/Math/MathML&amp;quot;&gt;&lt;mi xmlns=&amp;quot;&amp;quot;&gt;Q&lt;/mi&gt;&lt;mo xmlns=&amp;quot;&amp;quot; stretchy=&amp;quot;false&amp;quot;&gt;(&lt;/mo&gt;&lt;mi xmlns=&amp;quot;&amp;quot;&gt;f&lt;/mi&gt;&lt;mo xmlns=&amp;quot;&amp;quot; stretchy=&amp;quot;false&amp;quot;&gt;)&lt;/mo&gt;&lt;/math&gt;"&gt;&lt;span id="MathJax-Span-87" class="math"&gt;&lt;span&gt;&lt;span id="MathJax-Span-88" class="mrow"&gt;&lt;span id="MathJax-Span-89" class="mi"&gt;Q&lt;/span&gt;&lt;span id="MathJax-Span-90" class="mo"&gt;(&lt;/span&gt;&lt;span id="MathJax-Span-91" class="mi"&gt;f&lt;/span&gt;&lt;span id="MathJax-Span-92" class="mo"&gt;)&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span&gt;&amp;nbsp;values diminishes and nearly resolves magnitude discrepancies between the provinces. Correcting regional magnitude discrepancies between provinces is critical for reliable regional seismic hazard estimates because magnitude error in a particular region could lead to increased uncertainty in seismic hazard models.&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1785/0120190145</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Geological Society of America</dc:publisher>
  <dc:title>Earthquake magnitude and Lg Q variations between the Grenville and northern Appalachian geologic provinces of eastern Canada</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>