How to make high-resolution maps while reducing file size in ArcGIS and Adobe

A guest post by the Figure Master Lydia Staisch

Here is a map! It's LiDAR and scaled to a poster size of 45"x30" -- it has the potential to be an absolutely monstrous file size when exported.

CIG Webinar: The Release of the GEM Global Active Faults Database and Global Seismic Hazard Map

Yesterday (14 November 2019), I gave a webinar for the Computational Infrastructure for Geodynamics (CIG) group, based out of UC Davis. The webinar went well for most of the time, until my internet went out when I had a few slides left. Oh well...

At some point in the future …

SSA 2019: Presenting the 2018 GEM Global Seismic Hazard Map and Global Active Faults Database

This is the presentation I gave at the Seismological Society of America meeting in Seattle this spring.

Abstract

The Global Earthquake Model (GEM) Foundation has the mission to promote earthquake resilience worldwide by creating and maintaining earthquake hazard and risk models, and associated datasets and software for probabilistic seismic hazard …

TopoEurope 2019: Plate convergence, topography and faulting in the Himalaya and Tibet

In May of this year, I was invited to give a keynote address to the TopoEurope conference, which focused this year on subduction zones and topography.

The conference was excellent, and it was a good opportunity to revisit the topic of topographic and tectonic interplay, which I have not given …

The GEM Global Active Faults Database (and Webmap)

Over the past two years, I have been working for the Global Earthquake Model Foundation (GEM). My main task has been building the Global Active Faults Database (GEM GAF-DB), which is just what it sounds like—a database that contains all of the world's active faults. This work is nearing …

Making polygons from lines in Python

This post covers an algorithm to make polygons from connected lines, in the context of making geologic rock unit polygons from contacts mapped in a GIS program.

Mapping active faults for fault databases and seismic hazard analysis

cross-posted from the GEM Hazard Blog

I've had several conversations with geologists recently who are considering creating new active fault databases (or datasets). These geologists are all government scientists who are interested in both tectonics research and seismic hazard, and would like to make maintainable databases that suit both purposes …

A statistical picture of strain partitioning

Strain partitioning has interested me since I first heard about it. The basic idea is that in some regions, the strain field is not aligned exactly with the dominant fault system, so that fault system can't act as a 'pure' strike-slip or dip-slip fault system and relieve all of the …

The exponential decay of information

One of the major challenges of geology is the increasing sparsity of information about increasingly older times in Earth's history. This presents difficulties both when one is investigating a particular era, and when one is interested in looking at the frequency of events through time, or the frequency of rare …