|
Surface-wave
Magnitude Distance Factor |
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| Distance |
1.66 log10(distance) |
bsdist table |
|
| (degrees) |
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|
| 20 |
2.159709793 |
|
| 21 |
2.194884029 |
|
|
|
| 22 |
2.22842165 |
|
|
| 23 |
2.260468208 |
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|
| 24 |
2.291150661 |
|
|
| 25 |
2.320580414 |
|
|
| 26 |
2.348855758 |
|
|
| 27 |
2.376063849 |
|
|
| 28 |
2.402282332 |
|
|
| 29 |
2.427580677 |
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|
| 30 |
2.452021283 |
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|
| 31 |
2.475660412 |
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|
| 32 |
2.498548964 |
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|
| 33 |
2.52073314 |
|
|
| 34 |
2.542255002 |
|
|
| 35 |
2.563152954 |
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|
| 36 |
2.583462151 |
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|
| 37 |
2.603214862 |
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|
| 38 |
2.62244077 |
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|
| 39 |
2.641167248 |
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| 40 |
2.659419586 |
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|
| 41 |
2.677221202 |
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Dark line (Series1): |
|
| 42 |
2.694593822 |
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The equation for MS inlcudes the
distance term 1.66 log10 (distance) and is valid from 20 to 130 degrees. |
|
| 43 |
2.711557636 |
|
| 44 |
2.728131443 |
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Colored line (Series2): |
|
| 45 |
2.744332773 |
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The
table values in column C are used for distance greater than 130 degrees. The table takes into |
|
| 46 |
2.760178001 |
|
account the increase in amplitude as
the surface waves converge at 180 degrees. |
|
| 47 |
2.775682444 |
|
| 48 |
2.790860454 |
|
For
distance between 20 and 130 degrees:
MS = log10 (amp/t) + 1.66*log10(distance) + 3.3 |
|
| 49 |
2.805725493 |
|
For distance greater
than 130 and up to 180 degrees: MS = log10(amp/t) + bsdist(int(distance -
129.5)) + 3.3 |
| 50 |
2.820290207 |
|
(t is the period, which should be
between 18 and 22 seconds.) |
|
| 51 |
2.834566492 |
|
| 52 |
2.84856555 |
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| 53 |
2.862297944 |
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| 54 |
2.875773641 |
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| 55 |
2.889002065 |
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| 56 |
2.901992125 |
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| 57 |
2.91475226 |
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| 58 |
2.927290469 |
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| 59 |
2.939614339 |
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| 60 |
2.951731076 |
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| 61 |
2.963647526 |
|
| 62 |
2.975370205 |
|
| 63 |
2.986905312 |
|
| 64 |
2.998258757 |
|
| 65 |
3.009436172 |
|
| 66 |
3.020442933 |
|
| 67 |
3.031284172 |
|
| 68 |
3.041964795 |
|
| 69 |
3.052489491 |
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| 70 |
3.062862746 |
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| 71 |
3.073088859 |
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| 72 |
3.083171944 |
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| 73 |
3.093115948 |
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| 74 |
3.102924655 |
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| 75 |
3.112601697 |
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| 76 |
3.122150563 |
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| 77 |
3.131574604 |
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| 78 |
3.14087704 |
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| 79 |
3.150060972 |
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| 80 |
3.159129378 |
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| 81 |
3.168085131 |
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| 82 |
3.176930995 |
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| 83 |
3.185669633 |
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| 84 |
3.194303615 |
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| 85 |
3.202835417 |
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| 86 |
3.211267429 |
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| 87 |
3.219601959 |
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| 88 |
3.227841236 |
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| 89 |
3.235987411 |
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| 90 |
3.244042566 |
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| 91 |
3.252008711 |
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| 92 |
3.259887793 |
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| 93 |
3.267681695 |
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| 94 |
3.275392237 |
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| 95 |
3.283021185 |
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| 96 |
3.290570247 |
|
| 97 |
3.298041079 |
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| 98 |
3.305435286 |
|
| 99 |
3.312754423 |
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| 100 |
3.32 |
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| 101 |
3.32717348 |
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| 102 |
3.334276285 |
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| 103 |
3.341309793 |
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| 104 |
3.348275343 |
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| 105 |
3.355174236 |
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| 106 |
3.362007736 |
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| 107 |
3.368777071 |
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| 108 |
3.375483434 |
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| 109 |
3.382127987 |
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| 110 |
3.388711857 |
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| 111 |
3.395236145 |
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| 112 |
3.401701918 |
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| 113 |
3.408110216 |
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| 114 |
3.414462053 |
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| 115 |
3.420758415 |
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| 116 |
3.427000262 |
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| 117 |
3.43318853 |
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| 118 |
3.439324132 |
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| 119 |
3.445407956 |
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| 120 |
3.451440868 |
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| 121 |
3.457423715 |
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| 122 |
3.463357319 |
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| 123 |
3.469242485 |
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| 124 |
3.475079997 |
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| 125 |
3.480870622 |
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| 126 |
3.486615105 |
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| 127 |
3.492314177 |
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| 128 |
3.49796855 |
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| 129 |
3.503578919 |
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| 130 |
3.509145965 |
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| 131 |
3.514670351 |
3.49 |
|
| 132 |
3.520152726 |
3.5 |
|
| 133 |
3.525593724 |
3.5 |
|
| 134 |
3.530993965 |
3.5 |
|
| 135 |
3.536354056 |
3.51 |
|
| 136 |
3.541674588 |
3.51 |
|
| 137 |
3.546956141 |
3.51 |
|
| 138 |
3.552199283 |
3.51 |
|
| 139 |
3.557404568 |
3.52 |
|
| 140 |
3.562572539 |
3.52 |
|
| 141 |
3.567703727 |
3.52 |
|
| 142 |
3.572798652 |
3.52 |
|
| 143 |
3.577857822 |
3.52 |
|
| 144 |
3.582881737 |
3.53 |
|
| 145 |
3.587870884 |
3.53 |
|
| 146 |
3.592825741 |
3.53 |
|
| 147 |
3.597746776 |
3.53 |
|
| 148 |
3.602634448 |
3.53 |
|
| 149 |
3.607489206 |
3.54 |
|
| 150 |
3.61231149 |
3.54 |
|
| 151 |
3.617101733 |
3.54 |
|
| 152 |
3.621860356 |
3.54 |
|
| 153 |
3.626587775 |
3.54 |
|
| 154 |
3.631284397 |
3.54 |
|
| 155 |
3.635950619 |
3.54 |
|
| 156 |
3.640586833 |
3.54 |
|
| 157 |
3.645193423 |
3.54 |
|
| 158 |
3.649770764 |
3.54 |
|
| 159 |
3.654319226 |
3.54 |
|
| 160 |
3.658839171 |
3.54 |
|
| 161 |
3.663330954 |
3.54 |
|
| 162 |
3.667794924 |
3.53 |
|
| 163 |
3.672231423 |
3.53 |
|
| 164 |
3.676640788 |
3.53 |
|
| 165 |
3.681023347 |
3.52 |
|
| 166 |
3.685379426 |
3.52 |
|
| 167 |
3.689709342 |
3.52 |
|
| 168 |
3.694013408 |
3.52 |
|
| 169 |
3.69829193 |
3.51 |
|
| 170 |
3.702545209 |
3.51 |
|
| 171 |
3.706773543 |
3.51 |
|
| 172 |
3.710977222 |
3.5 |
|
| 173 |
3.715156531 |
3.49 |
|
| 174 |
3.719311752 |
3.47 |
|
| 175 |
3.723443161 |
3.44 |
|
| 176 |
3.727551029 |
3.41 |
|
| 177 |
3.731635622 |
3.39 |
|
| 178 |
3.735697204 |
3.34 |
|
| 179 |
3.739736031 |
3.29 |
|
| 180 |
3.743752358 |
3.19 |
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