SeismoScope PH

Data source: SQL Server

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Magnitude trend (map window)

Seismic activity · past 24 hours

26 Apr 2026 21:38 – 27 Apr 2026 21:38 (Asia/Manila)

Magnitude trend (3D window)

Depth distribution (3D)

26 Apr 2026 21:38 – 27 Apr 2026 21:38 (Asia/Manila)

Weekly Seismic Overview

Seismic Activity Report: Philippines (Last 7 Days)

Period of Analysis: February 21, 2026 - February 27, 2026

Total Events Recorded: 243

Overview:

The seismic activity in the Philippines over the past week has shown a notable range of magnitudes, with events primarily concentrated in the Mindanao region. The data indicates a mix of low to moderate seismic events, with several clusters of activity that warrant further analysis.

Magnitude Distribution:

The recorded seismic events ranged from magnitudes of 1.0 to 4.7. The most significant event was a magnitude 4.7 earthquake on February 22, located 34 km N 31° W of Dalupiri Island (Cagayan). This event was followed closely by several other notable earthquakes, including a magnitude 4.2 event on February 27, 323 km S 07° E of Balut Island (Davao Occidental), and a magnitude 4.1 event on February 25, 75 km S 60° W of Palimbang (Sultan Kudarat).

Cluster Analysis:

The data reveals several clusters of seismic activity, particularly in Mindanao and the Visayas regions. Notably, the Mindanao region has experienced a higher frequency of events, with several occurrences around the Sultan Kudarat area, indicating a potential active fault line. The Visayas region also reported multiple events, particularly near Surigao Del Sur and Eastern Samar, suggesting localized tectonic activity.

Depth Analysis:

The depth of the recorded earthquakes varied significantly, with the majority occurring at shallow depths of less than 30 km. The deepest recorded event was at 194 km, associated with a magnitude 4.2 earthquake on February 27. Shallow earthquakes are often more damaging due to their proximity to the surface, which is a critical factor for assessing potential impacts on populated areas.

Trench Involvement:

The Philippines is located along the Pacific Ring of Fire, characterized by numerous trenches and fault lines. The seismic activity observed in the past week aligns with the tectonic setting of the region, particularly the Philippine Trench and the Mindanao Trench. The clustering of events near these trenches suggests ongoing tectonic interactions, which are typical in this geologically active area.

Notable Events:

1. February 22, 2026: Magnitude 4.7 at a depth of 18 km, 34 km N 31° W of Dalupiri Island (Cagayan).

2. February 25, 2026: Magnitude 4.1 at a depth of 27 km, 75 km S 60° W of Palimbang (Sultan Kudarat).

3. February 27, 2026: Magnitude 4.2 at a depth of 49 km, 323 km S 07° E of Balut Island (Davao Occidental).

Conclusion:

The seismic activity in the Philippines over the past week has been characterized by a mix of low to moderate earthquakes, with significant events concentrated in Mindanao. The presence of clusters and the involvement of local trenches indicate ongoing tectonic processes that could pose risks to nearby communities. Continuous monitoring and further analysis are essential to assess potential hazards and inform preparedness measures in the region.

AI-generated report created on 2026-02-27T08:00:36.324747+08:00 (gpt-4o-mini).

Magnitude & Slip Summary

Latest AnalysisMath snapshot · 2026-02-27T00:30:01.344912+00:00 UTC · Window 30 days

Events analysed
1535
Mean magnitude
2.29
Strongest magnitude
5.80
Events M ≥ 4.0
55
Events M ≥ 5.0
7
Gutenberg–Richter b-value
0.76
Total seismic moment
1.64 ×10¹⁸ Nm
Radiated energy
92341.92 GJ
Equivalent slip
0.65 cm
Slip rate (approx.)
0.22 mm/day
Moment rate
0.06 ×10¹⁸ Nm/day
Energy proxy
82104.87 GJ
Data coverage
29.3 days

Slip estimates assume a 120 × 70 km fault and shear modulus of 30 GPa.

Daily earthquakes (30 days)

Daily seismic moment release

7-day Seismic Heat Map

Trench Contribution

The pie chart highlights which trenches account for the bulk of recent seismic activity.

Depth Distribution Histogram

Depth bins highlight how seismicity concentrates from shallow crustal levels to deep subduction zones.

Philippines 3D Cross-Section

The analysis of fracture clusters beneath the Philippines reveals critical insights into the region's tectonic dynamics and associated seismic hazards. Our examination here, based on event clusters, centroids, and depth ranges, identifies key characteristics of nine clusters across the area, each with distinct implications for seismic activity and hazard evaluation.

Cluster Overview:

Centroid located at 157.7 km along-strike and -40.6 km across-strike. This cluster is the most active, indicating a significant concentration of seismicity. Geographically, it aligns closely with the Manila Trench, suggesting it may be influenced by subduction processes.

Positioned at approximately 392.7 km along-strike, this cluster is situated in the eastern region near the Philippine Trench. The deeper average depth (26.3 km) suggests a relationship with the trench's activity and potential for larger subduction zone earthquakes.

Cluster 3, at -171.4 km along-strike (near the Mindanao region), shows a range of depths (2.0–101.0 km) indicating more complex tectonic interactions. In contrast, Cluster 4, located at -193.9 km, has a similar depth range (1.0–59.0 km) but lacks significant seismicity, perhaps indicating a less active tectonic environment.

These are less active, with clusters occurring at spatially more distant positions from major trenches. Clusters 5 (-107.2 km) and 6 (-191.9 km) have depths of about 6.0–30.0 km and 7.0–37.0 km, respectively, yet they may represent evolving stress fields rather than stable fault lines.

Clusters 7 (273.1 km) and 9 (-279.5 km) demonstrate mild seismicity, with narrower depth ranges, possibly indicating minor tectonic adjustments. For instance, Cluster 9’s location in a complex region suggests intricate interactions between nearby geological formations. Cluster 8 is very localized and characterized by shallow depths (1.0–33.0 km), indicating potentially minor, shallow crustal faults.

With shallow depths, Cluster 11 (266.4 km) shows less seismic activity and could suggest a stable area or insufficient data coverage.

Tectonic Implications:

The presence of these clusters indicates that the Philippines is situated at a critical convergent boundary with the Eurasian Plate and the Philippine Sea Plate. The more active clusters (1 and 2) align with significant geological features that drive earthquake generation, while the less active clusters can indicate areas of stress accumulation or tectonic quiescence.

Hazard Implications:

The primary risk from the identified clusters, particularly from Clusters 1 and 2, is the likelihood of significant seismic events affecting densely populated regions. As such, a better understanding of these clusters can aid in informing earthquake preparedness and risk mitigation strategies.

In conclusion, the analysis provided here illustrates not only the seismicity of the Philippines but the importance of monitoring these clusters to improve hazard assessments and readiness. This understanding can facilitate better urban planning and disaster response strategies in an earthquake-prone region.

This analysis was generated by the AI model GPT-4.

  • Cluster 1 (3012 events, depth range 1.0–51.0 km):
  • Cluster 2 (2040 events, depth range 1.0–79.0 km):
  • Clusters 3 and 4 (196 and 95 events, respectively):
  • Clusters 5 and 6 (27 and 18 events):
  • Clusters 7, 8, and 9 (58, 15, and 70 events):
  • Cluster 11 (25 events):

Seismic Activity Forecast (24 hours)

Mappa di previsione sismica nelle Filippine
Ultimo aggiornamento blob: 2026-02-27T00:00:07+00:00 · 448.7 KB

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EarthquakesPH · 14335 records

2025-10-01T08:01:00+08:00 – 2026-04-28T04:58:00+08:00

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Data source: DOST-PHIVOLCS (Department of Science and Technology – Philippine Institute of Volcanology and Seismology).