# EGMStream Webapp: EGMS Data Downstream Solution
## 3 Results  
This section illustrates how EGMStream enhances the ease and speed of processing and deploying EGMS products. To show the outputs that can be obtained using the webapp, data from the following seven different areas [71] were downloaded and converted:  
1. the volcanic area of Campi Flegrei, Gulf of Naples (Italy);
2. the landslide-prone slopes of southern Sorjorden, Tromso municipality (Norway);
3. the subsiding area of the Firenze-Prato-Pistoia basin (central Italy);
4. the Rules Dam and Reservoir, Granada province (Spain);
5. the archaeological site of Solnitsata-Provadia, Varna province (Bulgaria);
6. the mining subsidence in the Upper Silesian Coal Basin (Czech Republic). 7. the 2021 Larissa earthquake area, Thessaly region (Greece). The first example, Campi Flegrei, is a large volcanic system characterised by an active caldera formed approximately 39,000 years ago following the eruption of the Campanian Ignimbrite, one of the largest eruptions in the Mediterranean area [72]. This complex consists of numerous craters, fumaroles, thermal springs, and pyroclastic deposits, evidence of prolonged volcanic and hydrothermal activity. Geomorphologically, the area includes volcanic-origin hills shaped by significant ground uplift and subsidence, a phenomenon known as bradyseism, which has deeply influenced the landscape and human settlement over millennia [73]. The current volcanic activity is closely monitored, as the caldera is one of the most hazardous volcanic systems in Europe. The second sample refers to the slopes of southern Serfjorden, located about 50 km South of the Tromse city. Both the west- and east-facing slopes are very steep and susceptible to landslides due to geological and geomorphological conditions [74]. The third case is the Firenze-Prato-Pistoia basin in Central Italy, which is well-known for ground subsidence identified in the northern portion. The phenomenon was initially identified using ERS data [75; 76], and is primarily due to extensive agricultural and flower nursery activities in the Pistoia province, which require significant groundwater extraction, as well as the leather factories in the Prato province. A subsequent analysis with ENVISAT [77] and Sentinel-1 [78] data confirmed ground deformation in the northern portion of the basin. In the Prato province, a velocity inversion was recorded, indicating an uplift phenomenon related to the rebound of the water table following the relocation of leather factories abroad. The fourth case study concerns an infrastructure and its effects in southern Spain. The Rules Dam and Reservoir are relevant for water supply in the Granada area for both agricultural and domestic needs [79]. Several portions of the reservoir slopes are prone to landslides, with some areas actively affected by slope instability. This issue was also relevant during the construction of the Rules Viaduct, which crosses a right branch of the reservoir in a north-south direction. The fifth example is the archaeological site of Solnitsasa-Provadia (Bulgaria), discovered in 2005 and excavated until 2023. In prehistoric times, the area was dedicated to salt extraction through water boiling, and it has been recognised as the oldest salt production centre, with settlements dating back to 5500-4200 BCE [80]. In the mid-20 th century, the area underwent intensive industrial salt extraction by the injection of pressurised water, leading to the formation of underground dissolution chambers [81]. This also contributed to increased seismicity in the area starting from the 1970s [81; 82]. The second-to-last sample is the mining Upper Silesian Coal Basin, located between Poland and Czech Republic, which is affected by induced-mining subsidence. The mining area covers approximately 7500 km\({}^{2}\) and involves underground excavation using the chamber-and-pillar method, which causes the collapse of the overlying rock layers.