# Predicted surface waves arrival in Taup

**URL:** https://discourse.obspy.org/t/predicted-surface-waves-arrival-in-taup/1468
**Category:** ObsPy Related Projects
**Created:** [August 15, 2022, 10:18am UTC](https://discourse.obspy.org/t/predicted-surface-waves-arrival-in-taup/1468 "2022-08-15T10:18:40Z")
**Posts on this page:** 4
**Page:** 1

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### Author: ![Adnan\_Seismology](https://discourse.obspy.org/user_avatar/discourse.obspy.org/adnan_seismology/32/547_2.png) [@Adnan\_Seismology](https://discourse.obspy.org/u/Adnan_Seismology)
#### Post date: [August 15, 2022, 10:18am UTC](https://discourse.obspy.org/t/predicted-surface-waves-arrival-in-taup/1468/1 "2022-08-15T10:18:40Z")

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Hi everyone, I am looking for the arrivals to correspond to the surface waves in TAUP. So far I attempted with SS phase but when I review the waveform the predicted time earlier than the actual time. May someone suggest how can I fix this.

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### Author: ![megies](https://discourse.obspy.org/user_avatar/discourse.obspy.org/megies/32/9_2.png) [@megies](https://discourse.obspy.org/u/megies)
#### Post date: [August 17, 2022, 3:09pm UTC](https://discourse.obspy.org/t/predicted-surface-waves-arrival-in-taup/1468/2 "2022-08-17T15:09:27Z")

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I’m not sure if Taup even does calculate surface waves (unless you mean head waves traveling along e.g. the Moho). Even if it did, since it uses 1D layered models, it would just calculate some linear function of radial distance, I guess.

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### Author: ![droessler](https://discourse.obspy.org/user_avatar/discourse.obspy.org/droessler/32/545_2.png) [@droessler](https://discourse.obspy.org/u/droessler)
#### Post date: [August 22, 2022, 6:29am UTC](https://discourse.obspy.org/t/predicted-surface-waves-arrival-in-taup/1468/3 "2022-08-22T06:29:27Z")

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taup does not calculate the arrival times for surface waves. Due to dispersion you may however choose a velocity at some frequency and then compute it yourself as distance x velocity. Dispersion curves may computed by several pieces of software including CPS [1].

[1] [https://www.eas.slu.edu/eqc/eqccps.html](https://www.eas.slu.edu/eqc/eqccps.html)

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### Author: ![cweidle](https://discourse.obspy.org/letter_avatar_proxy/v4/letter/c/cab0a1/32.png) [@cweidle](https://discourse.obspy.org/u/cweidle)
#### Post date: [November 4, 2022, 9:16am UTC](https://discourse.obspy.org/t/predicted-surface-waves-arrival-in-taup/1468/4 "2022-11-04T09:16:41Z")

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Depends a bit on what you aim to do but to compute a window that contains teleseismic surface waves, the range 2.5 to 5 km/s group velocity is a good starting point.