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Effective monitoring strategies are essential for ensuring containment and conformance in subsurface injection operations, including those related to carbon storage, waste disposal, hydraulic fracturing, and enhanced oil recovery. To meet regulatory requirements and mitigate risk, a comprehensive approach requires a diverse set of monitoring tools, with passive seismic monitoring playing a critical role in detecting induced seismicity and assessing stress changes in the subsurface. This study evaluates the advantages of a hybrid seismic monitoring approach for injection-related applications. Hybrid systems integrate surface-based sensors (seismometers and accelerometers) with downhole components such as fiber optic arrays, 15 Hz geophones, and low-frequency geophones. This combination improves the detection of both microseismic events and larger seismic signals, enhances depth resolution, and increases sensitivity across a wide range of magnitudes. In certain configurations, downhole arrays also enable real-time monitoring of caprock and casing integrity—critical for containment assurance and early detection of anomalies. The paper presents field examples from a range of subsurface injection projects, demonstrating the effectiveness of hybrid seismic systems in improving data quality, detection capabilities, and confidence in operational decision-making. The findings highlight the value of hybrid monitoring as a powerful tool for supporting safe, compliant, and efficient injection operations across various industries.