Earthquake Crack Monitoring Malaysia How to Measure Building Cracks After Ground Tremors
Published: 28 August 2026 Earthquake Crack Monitoring Malaysia – How to Measure Building Cracks After Ground Tremors QUICK ANSWER If a crack is noticed after an earthquake or ground tremor, do not rely only on photographs or visual judgement. The first practical step is to establish: Where is the crack? How wide is it? Was it already there? Is it changing over time? Depending on what needs to be measured: Crack Width → Crack Width Meter Crack Change Over Time → Crack Monitor Building Movement → Total Station + Monitoring Prism Building Settlement → Auto Level + Levelling Staff Concrete Investigation → Appropriate Structural NDT Equipment MTM Precision supplies Crack Measurement, Survey Monitoring and Structural NDT Equipment in Malaysia for engineers, consultants, contractors, surveyors and building inspection applications. A CRACK APPEARED AFTER A TREMOR – WHAT SHOULD YOU DO? One important point should be established first: A crack noticed after an earthquake does not automatically mean the earthquake caused it. Some cracks may have existed beforehand. Others may be associated with: Concrete Shrinkage Thermal Movement Building Settlement Ageing Previous Construction Activity Ground Movement Structural Movement Instead of guessing the cause, start by documenting and measuring the crack. 1. MEASURE THE CRACK WIDTH Descriptions such as: “hairline crack” “small crack” or “quite serious crack” are subjective. A Crack Width Meter provides a quantitative measurement. Record: Crack ID Location Measured Width Date Photograph For example: Crack C01 Location: Selected wall Width: Recorded measurement Date: 28 August 2026 This provides a baseline for future comparison. 2. MONITOR WHETHER THE CRACK CHANGES One measurement tells you: How wide is the crack today? Repeated measurements answer: Is the crack becoming wider, narrower or remaining relatively stable? A typical monitoring sequence is: Baseline Crack Measurement ↓ Record & Photograph ↓ Repeat Measurement ↓ Compare Results ↓ Establish Trend Where longer-term monitoring is required, a suitable Crack Monitoring Device can provide a defined measurement location. 3. CRACK WIDTH METER VS CRACK MONITOR These products serve related but different purposes. Crack Width Meter Useful for measuring the current width of a crack. Applications include: Concrete Walls Columns Beams Slabs Retaining Walls Bridges Tunnels Crack Monitor Useful when the objective is to track movement or change over time. For many inspection applications, the two approaches can complement each other. 4. WHAT IF THE WHOLE BUILDING MAY HAVE MOVED? A crack measurement only tells you about the crack. It does not determine whether selected structural points have changed position. If building deformation is also a concern, consider: Total Station + Permanent Monitoring Prism + Stable Reference Points The process is: Baseline Position ↓ Repeat Survey ↓ Compare Coordinates ↓ Identify Positional Change This provides a different type of measurement from crack monitoring. 5. WHAT IF THE BUILDING HAS SETTLED? If the concern is vertical movement or settlement, appropriate survey levelling may be required. A typical solution is: Auto Level + Levelling Staff + Stable Benchmark + Settlement Monitoring Points The key measurement is: Previous Elevation vs Current Elevation Therefore: Crack Width Meter → Measures the crack Total Station + Monitoring Prism → Measures selected structural positions Auto Level + Levelling Staff → Measures elevation changes 6. CRACKS ON COLUMNS, BEAMS & STRUCTURAL ELEMENTS Cracks in structural elements should not be evaluated purely by purchasing a measuring instrument. A crack meter can provide useful quantitative information, but the location, orientation, pattern, width, development and structural context also matter. Where necessary, further professional investigation may involve suitable Concrete & Structural NDT Equipment. Depending on the engineering question, this may include: Concrete Rebound Hammer Rebar Scanner Concrete Cover Meter Ultrasonic Concrete Testing Equipment Other Appropriate Structural NDT Methods 7. CRACKS ON RETAINING WALLS After unusual ground movement, retaining structures may also require inspection. If a crack is present: Crack Width Meter → Measure crack width If wall movement is suspected: Total Station + Monitoring Prism → Monitor selected wall positions If settlement is suspected: Auto Level + Levelling Staff → Monitor elevation This is more useful than expecting one instrument to answer every question. 8. CRACKS IN BUILDINGS NEAR SLOPES For buildings near hillsides or slopes, visible cracking may lead to concerns about ground movement. Different measurements may be needed: Building Crack → Crack Monitoring Building Movement → Total Station Monitoring Building Settlement → Levelling Slope Surface Movement → Total Station + Suitable Monitoring Targets Where slope stability itself is a concern, specialist geotechnical investigation and instrumentation may also be required. 9. SHOULD YOU USE A VIBRATION METER? A normal handheld machinery vibration meter is not the first instrument to choose simply because an earthquake was felt. Machinery vibration meters are primarily intended for equipment such as: Motors Bearings Pumps Fans Compressors If the requirement is to record seismic ground motion, use: Purpose-Designed Seismic Monitoring Equipment If the requirement is to measure a building crack, use: Crack Measurement Equipment The instrument must match the measurement objective. 10. CREATE A SIMPLE CRACK MONITORING RECORD For each selected crack, record: Crack ID Location Date Initial Width Photograph Repeat Measurement Date New Width Observation / Remark Over time, this creates a useful monitoring history. Instead of saying: “I think the crack is getting bigger.” you have: Recorded Measurement → Repeat Measurement → Comparison WHICH EQUIPMENT DO YOU NEED? I Have a Visible Crack → Crack Width Meter I Want to Monitor the Crack Over Time → Crack Monitor I Think the Building Has Moved → Total Station + Monitoring Prism I Think the Building Has Settled → Auto Level + Levelling Staff I Need Further Concrete Investigation → Concrete & Structural NDT Equipment I Need to Record Seismic Motion → Purpose-Designed Seismic Monitoring Equipment FAQ How Do You Measure a Building Crack After an Earthquake? An appropriate Crack Width Meter or Crack Gauge can provide a quantitative crack-width measurement. Record the location, date and photograph for future comparison. How Do I Know Whether a Crack Is Growing? Establish a baseline and repeat the measurement at the same defined location using an appropriate crack monitoring method. Does a Crack Mean the Building Is Structurally Unsafe? Not necessarily. Crack significance depends on multiple factors and should be professionally assessed where structural safety is a concern. Can a Total Station Measure a Crack? A Total Station is not normally used to measure crack width. It can be used for suitable structural displacement monitoring of selected targets. Can a Rebound Hammer Check an Earthquake Crack? A rebound hammer measures a different concrete-related property. It does not determine the cause of a crack or independently determine structural safety. Where Can I Buy Crack Monitoring Equipment in Malaysia? MTM Precision supplies Crack Measurement, Total Station Monitoring, Settlement Monitoring and Structural NDT Equipment in Malaysia. Tell us what structure you are inspecting, approximate crack size and whether you need one-time measurement or long-term monitoring. IMPORTANT SAFETY NOTE If you observe major new cracks, rapidly changing cracks, visible structural deformation, damaged columns or beams, falling concrete or masonry, or other potentially serious signs, do not rely only on a crack meter. The structure should be assessed by appropriately qualified structural professionals. Measurement equipment provides data. It does not replace structural engineering assessment. CONTACT MTM PRECISION MTM Precision Sdn Bhd No. 29-1 & 29-2, Jalan Bandar 18, Pusat Bandar Puchong, 47160 Puchong, Selangor, Malaysia Website: www.mtmpre.com.my WhatsApp: +6016-660 7346 Email: mtmpre@yahoo.com
28 Aug 2026
