Comcot 1.7 Download May 2026

Comcot 1.7 is distributed as [freeware / open-source / trial]. Check the included LICENSE.txt for terms of use.

COMCOT version 1.7 (Cornell Multi-grid Coupled Tsunami model) is a highly specialized numerical modeling package used by researchers and government agencies to simulate the entire lifespan of a tsunami—from its initial generation at sea to its final inundation on the coast. Developed primarily by Xiaoming Wang and colleagues at Cornell University and later refined at GNS Science in New Zealand, the software has become a standard tool for disaster mitigation and academic study. Key Capabilities of COMCOT 1.7

Version 1.7 introduced significant technical improvements over its predecessors, making it more efficient and adaptable for large-scale simulations:

Nested Grid System: The software uses a multi-grid system (supporting up to 12 sub-level grids) that allows researchers to simulate broad transoceanic propagation at low resolution while using highly refined "nested" grids for detailed coastal run-up.

Hybrid Numerical Schemes: It solves shallow water equations in both Spherical and Cartesian coordinates. A key efficiency is its ability to use linear equations for deep ocean travel and nonlinear equations for shallow water where waves become more complex.

Multiple Generation Mechanisms: Beyond standard submarine earthquakes (using models like Okada 1985), version 1.7 can simulate tsunamis triggered by landslides, volcanic eruptions, or meteorite impacts.

Modernized Codebase: The transition from Fortran 77 to Fortran 90 allowed for dynamic memory allocation, making the program more expandable and the code cleaner. Practical Applications

Researchers use COMCOT 1.7 to reconstruct past catastrophes and predict future risks. For example, it has been used to model:

The 2004 Indian Ocean tsunami to study deposit patterns and inundation depths.

Worst-case scenarios for specific regions, such as predicting a 6.17-meter wave height in North Sulawesi following a hypothetical M8.5 earthquake.

The impact of the 2018 Mount Anak Krakatau flank collapse, helping authorities understand how landslide-triggered waves differ from seismic ones. Download and Documentation

While COMCOT is an "open-use" tool for the scientific community, it is typically distributed via academic or institutional portals rather than a direct commercial download link. COMCOT Tsunami Model User Manual 1.7 - Scribd

In the coastal village of Anyer, leaned over his monitor, watching the progress bar for COMCOT 1.7 slowly fill. As a seismologist, this software—the COrnell Multi-grid COupled Tsunami Model—was his primary tool for predicting how the ocean would react to the shifting tectonic plates beneath the Java Trench.

He had spent weeks preparing the input files, meticulous down to the last coordinate. Version 1.7 was critical; it featured an improved coupling scheme between spherical and Cartesian coordinates, allowing for more accurate simulations of how a wave would warp as it hit the shallow, jagged coastline [2].

As the download finished, Aris opened the comcot.ctl control file. He updated the fault parameters, setting up a simulation for a hypothetical 8.5 magnitude quake [3]. Outside, the actual sea was deceptively calm, but on his screen, the model began to "generate a story" of a different kind—a digital narrative of displacement and arrival times [4].

The simulation ran, showing the first wave's shadow effect being eliminated by the new RAM-based processing in the 1.7 utilities, giving him the highest time resolution possible [4]. It wasn't just data; it was a roadmap for the evacuation drills scheduled for the following Monday. By the time the sun set over the horizon, Aris had his results: a precise map of inundation that would eventually save the very village he called home. Technical Resources for COMCOT 1.7

If you are looking to download or work with this specific tsunami modeling software, these repositories and guides provide the necessary source code and documentation:

Source Code & Build Instructions: You can find the Comcot 1.7 source archive which includes the necessary README and dependency requirements like gcc or gfortran [1].

Gfortran Port: The comcot-gfortran GitHub repository contains the comcot.f90 main program and instructions on modifying the comcot.ctl input file [2, 3].

Utilities & Patches: For advanced features like automated arrival-time recording, the COMCOT-Utilities repository offers a specific patch for version 1.7 [4].

Training Guide: For those new to the model, the COMCOT Tsunami Model Training Guide provides a walkthrough on bathymetry collection and running simulations [8]. comcot 1.7 download

To download COMCOT v1.7 (Cornell Multi-grid Ocean Tsunami Model), you can typically find the source code and documentation through academic repositories or official research pages.  Where to Download 

Official Research Repositories: COMCOT is often hosted on platforms like GitHub or specific university servers (such as Cornell University or GNS Science). You should look for the repository maintained by Philip L-F. Liu or his research group.

Tsunami Research Portals: Sites like the Tsunami Information Center or regional disaster management portals often provide links to specific versions of simulation software used for inundation mapping.  Key Installation Steps 

Compiler Requirements: COMCOT is written in Fortran. You will need a compiler like gfortran or the Intel Fortran Compiler (ifort) installed on your system.

Environment Setup: Most versions require a Unix-like environment (Linux or macOS). Windows users may need to use WSL (Windows Subsystem for Linux) or Cygwin.

Compilation: Once downloaded, navigate to the source directory in your terminal and use the provided Makefile. Running the command make will usually generate the executable file.  Important Notes 

Documentation: Ensure you download the user manual (usually a PDF included in the package) to understand the input file structures (comcot.ctl) and bathymetry requirements.

Version Check: While v1.7 is a widely used stable release, check if there are newer versions (like v1.7.1 or v2.0) that may include bug fixes for multi-grid nested simulations. 

Downloading Comcot 1.7: A Comprehensive Guide

Comcot, short for Cornell COMET (Coastal Model), is a computational model used for simulating various coastal and oceanographic processes. Developed by the Cornell University, it's widely utilized by researchers, engineers, and students for understanding coastal dynamics, including wave propagation, tidal movements, and ocean circulation patterns. The version 1.7 of Comcot has been of particular interest due to its enhanced features and improvements over its predecessors.

For hazard managers, this is the most critical feature of v1.7.

COMCOT version 1.7 (Cornell Multi-grid Coupled Tsunami model) is a numerical modeling package designed to simulate the entire life cycle of a tsunami, from generation to coastal inundation. While it is widely used in academic research, version 1.7 is often available through repositories like GitHub or by contacting authors of relevant studies. Key Feature: Automated Multi-Grid (Nested) System

The standout feature of COMCOT 1.7 is its Nested Grid approach, which allows for cross-scale tsunami modeling.

Dynamic Resolution: Users can simulate large-scale tsunami propagation across deep oceans using a coarse grid while simultaneously modeling fine-scale run-up and coastal flooding using high-resolution sub-grids.

Automatic Matching: The model supports automatic nested-grid matching, where sub-level grid regions are specified by coordinates, ensuring a seamless transition of wave data between different resolution layers.

Variable Time Stepping: Unlike older versions where the time step ratio was fixed (typically 2), version 1.7 determines the time step size based on water depth, optimizing both speed and stability.

Efficiency: This system enables up to 12 sub-level grids, allowing researchers to focus computational power on critical coastal areas without needing to run high-resolution simulations over the entire ocean. Core Technical Capabilities

Governing Equations: It provides a choice between Linear and Nonlinear Shallow Water Equations (SWEs).

Coordinate Flexibility: Supports both Spherical coordinates (for trans-oceanic propagation) and Cartesian coordinates (for local nearshore studies).

Tsunami Generation: Capable of implementing up to 99 fault planes at different times to model complex earthquake-triggered generation mechanisms. Comcot 1

Inundation Modeling: Uses a Moving Boundary Technique to accurately track the shoreline as the tsunami moves inland. Integration and Utilities COMCOT: A tsunami generation, propagation and run-up model

Software. This tsunami modelling package is developed to study the entire life-span of tsunami, including generation, propagation, GNS Science

COMCOT 1.7 (Cornell Multi-grid Coupled Tsunami model) is a widely used numerical modeling package designed to simulate the entire life cycle of a tsunami—from its generation and deep-ocean propagation to nearshore run-up and coastal inundation. Key Features of COMCOT 1.7

Developed primarily by Xiaoming Wang (GNS Science) and researchers at Cornell University, this version introduced several critical improvements:

Nested Grid System: Allows for high-resolution modeling near the coast while maintaining computational efficiency over long distances in the open ocean.

Flexible Coordinate Systems: Supports both Spherical and Cartesian coordinates, allowing for accurate global and local simulations.

Multiple Generation Mechanisms: Can model tsunamis triggered by earthquakes (fault planes) and submarine landslides.

Moving Boundary Scheme: Specifically designed to calculate coastal inundation and run-up heights by tracking the changing shoreline. Where to Download COMCOT 1.7

COMCOT is generally available as a research tool. You can find the core files and documentation through the following sources:

Source Code (Fortran): A community-maintained version optimized for modern compilers like gfortran is available on GitHub.

User Manuals: Detailed documentation for version 1.7, including input/output configurations and governing equations, is hosted on platforms like Scribd and ResearchGate.

Related Utilities: Patches and data processing tools for COMCOT can also be found in the COMCOT-Utilities repository. Installation Notes

COMCOT is typically written in Fortran 90. To run the model, you will need: A Fortran compiler (e.g., GFortran or Intel Fortran). Bathymetric data (often sourced from GEBCO).

Post-processing scripts, often in MATLAB or Python, to visualize the water surface elevation and flooding extent. COMCOT Tsunami Model User Manual 1.7 - Scribd

COMCOT (COrnell Multi-grid Coupled Tsunami Model) version 1.7

is a widely used numerical model for simulating tsunami generation, propagation, and coastal inundation. Key Features of COMCOT 1.7

The "good features" frequently highlighted in its documentation and research applications include: Nested Multi-Grid System

: Allows for high-resolution modeling in coastal areas while maintaining efficient, lower-resolution simulations in the deep ocean. Diverse Generation Mechanisms

: Capable of modeling tsunamis triggered by submarine landslides, earthquake fault planes (up to 99 simultaneously), or a combination of both. Coordinate Flexibility : Supports both Spherical coordinates (for deep ocean propagation) and Cartesian coordinates (for local coastal run-up). Governing Equations

: Offers a choice between linear and non-linear shallow water equations, utilizing an explicit staggered leap-frog finite difference scheme for calculations. Inundation Modeling COMCOT version 1

: Includes a "moving boundary scheme" to accurately simulate wave run-up and the extent of flooding on dry land. Adjustable Time Steps

: Version 1.7 improved efficiency by allowing the time step ratio between parent and child grids to vary based on water depth, rather than being fixed at a set ratio. Downloads and Resources

As an open-source academic tool, it is primarily distributed through research repositories: Source Code

: You can find version 1.7 source files (typically in Fortran) on GitHub (comcot-gfortran) or specialized forks like the COMCOT typhoon model Documentation : Detailed usage instructions are available in the COMCOT 1.7 User Manual on Scribd Zenodo repository setting up the input files for a specific tsunami simulation scenario? comcot-gfortran/comcot.f90 at master - GitHub

COMCOT version 1.7 (COrnell Multi-grid COupled Tsunami Model) is a powerful, long-standing numerical tool for simulating the entire lifespan of a tsunami—from generation and propagation to coastal run-up and inundation.

Developed by Xiaoming Wang at Cornell University, this version is widely regarded as a benchmark in tsunami modeling due to its efficient use of nested grids

. These grids allow researchers to use coarse resolution in the deep ocean and transition to ultra-fine resolution near the shore, providing high-accuracy results without overwhelming computational costs. Key Features of COMCOT 1.7 Dual Governing Equations

: It can solve both linear and non-linear shallow water equations, making it versatile for deep-sea propagation and complex nearshore dynamics. Nested Grid System

: Dynamically couples multiple layers of different resolutions to capture small-scale coastal features. Flexible Source Mechanisms

: Supports various seafloor disturbances, including seismic faulting and initial water surface displacements. Coordinate Flexibility

: Operates in both Spherical (for global/regional scales) and Cartesian (for local coastal scales) coordinate systems. Where to Find the Download

While the original official distribution was through Cornell University, the most reliable modern way to access the source code and its utilities is through academic repositories and community-maintained mirrors: Source Code & Utilities : Community versions and patches, such as AndybnACT's COMCOT-Utilities

, often include performance upgrades like faster arrival time processing. Specialized Variants

: Versions adapted for specific use cases (like typhoon models or GPU acceleration) can be found on platforms like Documentation

: Detailed user guides explaining the input parameters (bathymetry, fault parameters) and output structures are available on Semantic Scholar Are you planning to use COMCOT for a specific historical event real-time hazard mapping COMCOT Tsunami Model User Manual 1.7 - Scribd

Once you've identified a reliable source, navigate to the section of the website where software downloads are hosted. This might be labeled as "Downloads," "Software," or specifically as "Comcot."

After successful installation:

A typical working download path (as of 2025) might be: https://archive.org/details/comcot_1.7_full (Note: This is an example – always verify before clicking.)

COMCOT (Cornell Multi-grid Coupled Tsunami Model) is one of the most widely recognized open-source numerical simulation tools for modeling the complete life cycle of a tsunami—from generation to propagation and inundation. Version 1.7 represents a stable, mature iteration of this Fortran-based code, widely used by researchers and hazard assessment agencies.

Here is a detailed breakdown of the software's features and a guide to the "download" process, which often confuses new users due to the academic nature of the software.

COMCOT is a numerical model used to simulate the generation and propagation of tsunamis. It was developed at Cornell University. It is notable because it uses a modified leap-frog finite difference scheme to solve the nonlinear shallow water equations.

Key capabilities include: