where a is in cm∕s2, α0= 1.237, α1= 1.519, α2= -0.0313, α3= -0.844, α5= -0.004 and σ = 0.780.
Exclude records from soft soil sites or with previously known site effects (amplification or deamplification).
Focal depths between 5 and 80km.
Also derive equation using functional form lna = α0+ α1M + α2lnR + α4R.
Select records from stations located along the seismically active Mexican Pacific coast.
Only use records from earthquakes with M > 4.5.
Exclude data from normal faulting earthquakes using focal mechanisms, focal depths, location of epicentre
and characteristics of records because subduction zone events are the most dominant and frequent type of
earthquakes.
Use Mw because consider best representation of energy release.
Visually inspect records to exclude poor quality records.
Exclude records from dams and buildings.
Exclude records from ‘slow’ earthquakes, which produce smaller short-period ground motions.
Correct accelerations by finding quadratic baseline to minimize the final velocity then filter using most
appropriate bandpass filter (low cut-off frequencies between 0.05 and 0.4Hz and high cut-off frequency of
30Hz).
Use data from 105 stations: 7 in Chiapas, 6 in Oaxaca, 6 in Colima, 19 in Jalisco, 49 in Guerrero, 14 in
Michoacán and 6 near the Michoacán-Guerrero border.
