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Terms & Conditions


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Privacy and Cookies

Data Security

Website Terms and Conditions

Software Licensing Terms

Privacy and Cookies

We may change this privacy notice from time to time by updating this page.

What information do we collect?

When you use this website, we may collect the following information:

  • the areas of the website that you visit
  • information about your computer, such as which browser you are using, your network location, the type of connection you are using (e.g. broadband, ADSL etc) and your IP address

We do this by using cookies, which are small files that help us track how our visitors use the website and enable us to understand where we can improve your experience. If you would like to find out which cookies we use and the information they track see our Cookies Policy.

Once you submit or register information through our website we will know who you are and your activities on this website and information about you and/or your company may be recorded on our systems. For example, we may ask for personal information when you download our software including:

  • your name
  • company name
  • email address
  • postal address
  • telephone number
  • country where you are based
  • Social media ID
  • your comments/questions
  • services/markets you are interested in

We may also collect personal information from telephone calls and/or other correspondence with you.

What do we do with the information we collect?

The information we capture is used for various purposes. The main purpose is to provide you with our services (whether available via the website or offline). We also use the information for:

  • website development
  • understanding how our visitors interact on the website
  • understanding what our clients are interested in
  • understanding what potential clients are interested in
  • dealing with enquiries/concerns
  • marketing our services and people to you
  • market research
  • service development
  • internal record keeping


We would like to provide you with information about our services and other information which we think you may find interesting. We may send you such information by post, email and/or telephone, unless you have asked us not to do so.

We will not provide your personal information to other organisations for marketing purposes without your explicit consent.

If at any time you do not want your information used for direct marketing purposes, please contact us or follow the unsubscribe link in our marketing email messages.

Who do we share this information with?

We may share your personal information with companies acting on our behalf who will only use the information to provide that service. However, we will retain control of your data and any third party service provider that we use must act in accordance with our instructions. We may also share your personal information with a purchaser or potential purchaser of our business.

In some circumstances, we may have to disclose your personal information by law, because a court or the police or other law enforcement agency has asked us for it.

How to get copies of or amend the information we have collected

You may request details of the personal information that we hold about you under data protection laws. If you would like a copy of the information held about you please write to us at oasys@arup.com or at: Data Protection Officer, 13 Fitzroy Street, London, UK, W1T 4BQ. Please note that we may charge a small £10 administration fee for information requests.

If you think any information we have about you is incorrect or incomplete, please email us as soon as possible. We will correct or update any information as soon as we can.

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Data Security

We are committed to ensuring that your information is secure. In order to prevent unauthorised access or disclosure we have put in place suitable physical, electronic and managerial procedures to safeguard and secure the information we collect, including locked cabinets, electronic password protection and pass card access to buildings.

If at any point you suspect or receive a suspicious communication from someone suggesting they work for Oasys or a website claiming to be affiliated with Oasys, please forward the communication to us or report the incident by email to oasys@arup.com or in writing to Oasys, 13 Fitzroy Street, London, UK, W1T 4BQ as soon as possible.

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Website Terms and Conditions

The contents of this web site are protected by copyright and other intellectual property rights under international conventions. No copying of any words, images, graphic representations or other information contained in this web site is permitted without the prior written permission of the webmaster for this site.

Oasys accepts no responsibility for the content of any external site that links to or from this site.

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Software Licensing Terms

Terms and Conditions of Purchase

The full conditions of purchase and maintenance for all Oasys software are set out in the Oasys Software Licence and Support Agreement. All prices are subject to TAX at the current rate.

Prices and specifications are subject to change without notice – please ask for a written quotation.

Although every care has been taken to ensure the accuracy of all information contained herein, the contents do not form or constitute a representation, warranty, or part of any contract.

Superseded Versions of Terms and Conditions

Oasys keeps copies of all superseded versions of its terms and conditions.

Maintenance & Support Services

Support and maintenance is included with all subscription licences for their full duration.

Annual maintenance contracts are available for software under a perpetual licence, prices are based on a percentage of the most recent list price.

This service includes:

  • telephone/fax/email/web based support
  • free software updates available via internet download
  • personalised output header for many products

Siren Change Log

All notable changes to Siren will be documented within the change log.

New Features

Siren 8.3 New Features

  • COM interface added to allow automation (e.g. from Excel macro).
  • Option for automated batch testing of files.

Siren 8.3 Minor Enhancements

  • Results added to file reading and writing.
    [SIREN-5] (Added 23 February 2017, released in Siren.exe
  • Analysis code optimised to reduce analysis time.
    [SIREN-6] (Added 23 February 2017, released in Siren.exe
  • Updated COM interface including .NET wrapper to allow alternate access.
    [SIREN-8] (Added 20 March 2017, released in Siren.exe


  • Materials table did not allow new pages to be created.
    [NCR 9074] (Fixed 6 June 2014, released in Siren.exe
  • Calculation of frequency amended to F = Vs/(pi x H).
    (Fixed 30 March 2015, released in Siren.exe
  • Paste to tables not functioning.
    [NCR 10195](Fixed 8 April 2015, released in Siren.exe
  • Disp v Depth graph not accepting times > 0.00.
    [SIREN-1](Fixed 15 June 2015, released in Siren.exe
  • Discrepancy between relative displacement in full results, and maximum in summary.
    [SIREN-2](Fixed 27 Jan 2017, released in Siren.exe
  • Full results being exported from graph even when interval between outputs set to >1.
    [SIREN-4](Fixed 27 Jan 2017, released in Siren.exe
  • Program crashes when right clicking on the time history tabs.
    [SIREN-3] (Added 23 February 2017, released in Siren.exe
  • Error in tabular output – showing ‘i’ for number of time steps between output instead of number.
    [SIREN-7] (Added 23 February 2017, released in Siren.exe
  • Error in ‘.txt’ file import.
    [SIREN-10] (Added 25 April 2017, released in Siren.exe
  • Manual updated to clarify time step used for response spectrum/spectral ratio.
    [SIREN-11] (Added 25 April 2017, released in Siren.exe
  • Error reading in txt files.
    [SIREN-12] (Added 20 September 2017, released in Siren.exe

New Features

  • Capability to handle multiple time histories.
  • Time histories can be treated as X and Y pairs.
  • Analysis of selected or all time histories.
  • Improved control of export to LS-DYNA allowing choice of results to export and control of the load curve ids.
  • Auto termination of analysis cased on the duration of the time history.


  • Materials table did not allow new pages to be created.
    [NCR 2523] (Fixed 15 February 2008, released in Siren.exe
  • When “auto” is given for Analysis end time in Analysis control, in Depth vs Disp. not taking time other than zero.
    [NCR 3352] (Fixed 25 February 2009, released in Siren.exe

New Features

  • none


  • Siren is a new program which provides the functionality, previously available in GdUte, for predicition of site resposne to a seismic event.
  • Data can be specified quickly through the use of wizards or in tables with options to import data from file.
  • Dockable gateway for quick access to data.
  • Full control over the analysis settings and output.
  • Full range of graphical output options:
    • nodes: displacements, velocities and accelerations (absolute and relative)
    • elements: stress and strain (time histories and hysteresis charts)
    • response spectra: displacements, velocities and accelerations
    • general: interpolation, least squares fit, running RMS, FFT, inverse FFT, filtering, power spectral density
  • Export to Sigraph for further processing

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