SeismoScope PH

Data source: SQL Server

Last hour activity

Loading latest events…

Magnitude trend (map window)

Seismic activity · past 24 hours

24 Aug 2026 22:08 – 25 Aug 2026 22:08 (Asia/Manila)

Magnitude trend (3D window)

Depth distribution (3D)

24 Aug 2026 22:08 – 25 Aug 2026 22:08 (Asia/Manila)

Weekly Seismic Overview

Seismic Activity Report: Philippines (Last 7 Days)

Overview:

The seismic activity in the Philippines over the past week has been characterized by 516 recorded events, with a notable distribution across various regions, particularly Luzon and Mindanao. The data indicates a mix of low to moderate magnitudes, with significant clusters observed in specific areas.

Magnitude Distribution:

The recorded magnitudes ranged from 1.0 to 5.7, with the majority of events falling between 1.5 and 3.0. The most significant event was a magnitude 5.7 earthquake located 144 km N 47° W of Itbayat (Batanes) on August 19, 2026. This event, along with several others in the 4.0 to 5.0 range, highlights the ongoing tectonic activity in the region.

Notable Clusters:

1. Mindanao Region:

- A cluster of seismic activity was observed around Balut Island and the Municipality of Sarangani, with multiple events recorded in close succession, particularly on August 19. The area experienced several magnitudes above 2.0, including a magnitude 5.2 event, indicating heightened tectonic stress.

- The Davao Occidental region also showed significant activity, with multiple events recorded at depths varying from 10 to 300 km, suggesting a complex interaction of tectonic plates.

2. Luzon Region:

- Luzon experienced notable seismic events, particularly in the northern part, including the Batanes and Cagayan areas. The highest magnitude recorded was 5.7, which occurred near Itbayat.

- The Ilocos region also reported several low-magnitude events, indicating ongoing tectonic activity.

Depth Analysis:

The depth of seismic events varied significantly, with many shallow earthquakes (less than 20 km) indicating near-surface tectonic activity, particularly in Mindanao. Conversely, deeper events (over 100 km) were recorded, particularly in the Davao region, suggesting subduction zone interactions.

Trench Involvement:

The Philippine Trench and the Mindanao Trench are likely contributors to the seismic activity observed. The clustering of events in Mindanao, particularly around Balut Island, aligns with the tectonic features associated with these trenches. The depth and magnitude of certain events suggest that the subduction processes are actively influencing the seismic landscape.

Conclusion:

The seismic activity in the Philippines over the past week underscores the region's tectonic complexity, with significant clusters in Mindanao and Luzon. The presence of moderate to high-magnitude events, particularly near known trenches, highlights the ongoing geological processes at play. Continuous monitoring is essential to assess potential risks and enhance preparedness in affected areas. Further analysis of the data will be crucial in understanding the implications of these seismic events on local communities and infrastructure.

AI-generated report created on 2026-08-25T20:00:17.474116+08:00 (gpt-4o-mini).

Magnitude & Slip Summary

Latest AnalysisMath snapshot · 2026-08-25T00:30:01.103283+00:00 UTC · Window 30 days

Events analysed
2261
Mean magnitude
2.34
Strongest magnitude
7.00
Events M ≥ 4.0
75
Events M ≥ 5.0
16
Gutenberg–Richter b-value
0.68
Total seismic moment
46.20 ×10¹⁸ Nm
Radiated energy
2598211.76 GJ
Equivalent slip
18.33 cm
Slip rate (approx.)
6.26 mm/day
Moment rate
1.58 ×10¹⁸ Nm/day
Energy proxy
2310173.24 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

Six-month 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: 2026-08-25T12:00:09+00:00 · 437.4 KB

Restricted Administration

Sign in with Google to unlock administration tools.

Secure console

Access granted for authorized operators only.

EarthquakesPH · 25998 records

2025-10-01T08:01:00+08:00 – 2026-08-26T05:44:00+08:00

Need access? Ask the platform owner to whitelist your Google account.

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