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Myanmar Earthquake Shaking Map: What Intensity Data Shows

The USGS ShakeMap for the March 2025 Myanmar earthquake estimates how strongly the ground shook across the region, which is different from the earthquake's single magnitude value.

Timeline

  1. March 28, 2025: A magnitude 7.7 earthquake struck near Mandalay at a shallow depth of about 10 kilometers.
  2. March 28, 2025: USGS released rapid products including ShakeMap, PAGER and ground-failure assessments.
  3. April 3, 2025: USGS summarized updated response products and preliminary rupture mapping for the event.

The USGS shaking map for the March 28, 2025 Myanmar earthquake shows estimated ground-shaking intensity across a wide area. It does not give every place a separate earthquake magnitude. Magnitude 7.7 describes the overall size of the event, while intensity describes how strong the shaking was at a particular location and how its effects may have varied from place to place. [1][2][3]

USGS reported that the earthquake occurred near Mandalay at a shallow depth of about 10 kilometers. Strong motion was felt far beyond the source region, including in Bangkok. ShakeMap turns the available observations and calculations into a regional picture, using a color scale based on Modified Mercalli Intensity and related measures of ground motion. [1][2]

The colors should be read as bands of estimated intensity. Lower levels generally correspond to weak shaking and limited effects, while higher levels describe increasingly severe shaking and potential damage. The boundaries are not physical walls. They are interpolated contours within a model, and conditions can change over short distances even when adjacent places share the same displayed color. [2][3]

ShakeMap combines instrumental recordings, information about the earthquake source and ground-motion models. Where instruments are sparse, the estimate depends more heavily on modeling. Local geology can also amplify or reduce motion: soft sediments, river basins, distance from the rupturing fault and the frequencies to which buildings respond can all make the experience different from a simple distance-based expectation. [2][3]

Community reports, often collected through the USGS Did You Feel It system, answer a related but separate question. They summarize what respondents experienced and what effects they observed. Those reports can add useful coverage, but the pattern also reflects where people had internet access and chose to respond. A dense cluster of reports is not automatically a precise measure of structural damage. [2][3]

Early maps can change as more station readings, public reports and fault models arrive. That is a normal part of rapid earthquake analysis. USGS also publishes separate PAGER estimates of population and loss exposure and ground-failure products for landslide or liquefaction potential. Each product addresses a different problem, so a ShakeMap alone should not be treated as a final loss assessment. [1][2]

The safest interpretation is regional: the map identifies where shaking was probably strongest and helps responders prioritize broad areas. It cannot confirm whether a particular building is safe, reconstruct every second of the rupture or replace an engineering inspection. For a single address, readers should combine the latest map revision with local emergency information and qualified structural assessment. [1][2][3]

Sources

  1. USGS — M7.7 Mandalay, Burma (Myanmar) Earthquake
  2. USGS — March 2025 Myanmar earthquake ShakeMap
  3. USGS Earthquake Hazards Program — ShakeMap overview

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