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enter image description hereI have a problem with repetition for describing this graph. This graph represents the strong ground motion acceleration (vertical axes) over the period (the horizontal axes) for different return periods with and without incorporating an effect called the directivity effect. Dashed lines are the ones including the directivity effect and solid lines do not contain this effect. The upper two lines (i.e. the red line with its dashed line) represent the acceleration for the longer return period (2475 years), while the lower lines (the green line with its dashed line) show the acceleration for a shorter return period (475 years). I want to say this: As the period (horizontal axes) increases, the dashed line of the red line increases more than the dashed line of the green one. It means the effect of directivity is higher on the 2475 years return period and is smaller on the 475 years return period. I wrote this:

"For longer return periods, the effect of directivity on strong ground motion acceleration is more than the effect of directivity on strong ground motion acceleration for shorter return periods."

I tried to avoid repetition using "than that of" but I thought it could not be appropriate. I was wondering if you could let me know how I can avoid the repetition of "the effect of directivity on strong ground motion acceleration".

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You could rearrange the sentence to make the subject clearer:

The effect of directivity on strong ground motion acceleration is greater for longer periods

and then everything before is in that phrase can simply be referred to by it:

... than it is for shorter periods.

You could even get rid of it altogether:

The effect of directivity on strong ground motion acceleration is greater for longer periods than for shorter periods.

Of course, if you're mentioning "longer periods" then you must be comparing to periods which are shorter, so that can go too:

The effect of directivity on strong ground motion acceleration is greater for longer periods.

And if that's the case you may be able to draw a general conclusion:

The effect of directivity on strong ground motion acceleration increases with period length.

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  • Dear Andrew, thanks for your useful comment. I'd like your last sentence and wanna combine it with your previous suggestion. Is it true to say: "The effect of directivity on strong ground motion acceleration increases with period length and is greater for longer periods than for shorter periods." Feb 20 at 19:11

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