(after Scandone et al. 1993)
| BEGIN (d-m-y) | END (d-m-y) | Length (days) | Type-Volume | VEI | VOLCANOLOGICAL OBSERVATIONS |
| 8 Sep 1899 | 26 Aug 1903 | 1447 | A | Strombolian activity, particularly violent on 9-10 May 1900. Increase of explosivity during 1903. The diameter of the crater is 148 m in Mar 1903, with a depth of 60 m. | |
| 27 Aug 1903 | 30 Sep 1904 | 400 | IE effusive explosive volume =0,5 x 10^6 m^3 | 2 | Since 27 Jul 1903, intracrateric lava . On 22 Aug, collapse of the conelet, lava outflow to the W. On the 26th, fracture on WNW, explosion and lava flow onto Colle Umberto. On the 27th, fracture trending ENE at 800 m asl with lava flow. Collapse by 130 m of the crater with Vulcanian explosions. Lava flows from 14 to 16 Sep, 15-19 Oct and 20 Nov. By Mar 1904, a new lava shield has grown 40 m high. On 21 and 22 Sep 1904, explosions at the crater. Tremor on 23-24 Sep. On the 25th, ash at Boscoreale and on the 26th, collapse of the conelet and explosions. On the 28th, ash as far as Avellino. |
| 1 Oct 1904 | 2 Feb 1906 | 489 | A | Mild explosive activity in Nov and Dec 1904 and Jan 1905. In May 1905, new vents on the NW side of Gran Cono at 1245 m and 1180 m elevation with lava emission, again in Jan 1906. | |
| 3 Feb 1906 | 3 Apr 1906 | 59 | IE effusive volume =1.8 x 10^6 m^3 | 1 | Explosive activity during Feb 1906; since Mar, lava from vent at 1180 m |
| 4 Apr 1906 | 22 Apr 1906 | 18 | FE (1906) Effusive-explosive volume =20 x 10^6 m^3 lava | 3-4 | On 4 Apr at 0530, black smoke and partial collapse of the cone; new vent at 1200 m on S flank of Gran Cono; lava; seismic activity; at 1400, collapse of conelet; explosive activity from Strombolian to Vulcanian; at midnight, vent at 800 m, pouring lava. On 5 Apr, violent explosions and lava emission; on the 6th at 0800, vent at SE at 600 m asl; lava; intense activity at the crater; at midnight, increase of seismicity. 7 Apr, new vent toward E, and lava toward Terzigno; outflow at the central crater; at 1900, explosions with incandesent ejecta up to 1-2 km above crater; at 2100, explosion with fragmentary material; at 2300, new lava emission;on 8 April at 0030, strong explosions and earthquake; at 0230, violent earthquake with explosion and emission of ash, incandescent material and lithics; after 0400, ash column 600 m wide; during the afternoon, column 13 km high, decreasing during the evening; on 9-10 Apr, gas and ash emission (with pisolites) ; 11-12 Apr, grey ash; 13-14 Apr, white ashes; 20-21 Apr, mild activity. Since late Apr, lahars for many months after the eruption. Great damage in Ottaviano and San Giuseppe, and widespread damage all around the volcano; at least 500 people killed. Volume of the new crater: 84 x 10^6 m^3 |
| 23 Apr 1906 | 4 Jul 1913 | 2629 | R | Collapse of the bottom of the crater in Jun 1911, and on 9 May 1913. Since Jul 1913, glow is seen at the crater floor. | |
| 5 Jul 1913 | 26 Nov 1926 | 4892 | A | Since 17 Sep 1916, conelet. Filling of the crater with lava; particularly voluminous during 1917 and through Sep 1919; again in Jul 1920. In 1925, the crater is filled by 3/4 | |
| 27 Nov 1926 | 28 Nov 1926 | 1 | IE effusive | 1 | Outflow on 27 Nov 1926 toward E-NE |
| 29 Nov 1926 | 30 Jul 1927 | 243 | A | Intracrateric lava flows | |
| 1 Aug 1927 | 2 Aug 1927 | 1 | IE effusive | 1 | Since 29 Jul, intracrateric lava outflowing, on 1 Aug, to E |
| 3 Aug 1927 | 10 Aug 1928 | 373 | A | ||
| 11 Aug 1928 | 12 Aug 1928 | 1 | IE effusive | 1 | Outflow |
| 13 Aug 1928 | 2 Jun 1929 | 293 | A | ||
| 3-6-1929 | 8-6-1929 | 5 | IE effusive explosive volume =12 x 10^6 m^3 | 2-3 | Since 27 May, no activity. On 31 May, moderate Strombolian activity until 2 Jun. At 1500 on 2 Jun, frequent earthquakes. On the 3rd, two strong earthquakes with collapse of the conelet and rapid lava emission, outflowing to E. Scoria ejection up to 300 m. From 0000 until 0100 on 4 Jun, strong explosive activity with new lava flow. At 0330, lava fountains 300 m high lasting half an hour. Increase at 0630 with new lava and ejection of scoriae inclined to W. Since 0800, lava flow, outside Somma caldera, toward Terzigno. At 1409, new lava fountain, 400 m high, lasting 26 minutes. Destruction of the conelet, carried away by the lava flow . At 1530, explosions. At 1930,third lava fountain, lasting 39 minutes, 400 m high. Eruptive cloud 3-5 km above the rim. On 5 Jun, between 0030 and 0345 increase of activity and 4th lava fountain at 0430, 500 m high, with eruption column up to 4 km. Lava outflow to the W. |
| 9 Jun 1929 | 10 Jun 1930 | 396 | A | Rare explosions on 13-26 Jul, 23-24 Sep and 4 Oct. On 2 Nov, a new conelet begins to form. | |
| 11 Jul 1930 | 30 Jul 1930 | 19 | IE effusive | 1 | Since 11 Jul 1930, lava flow on NE flank of Gran onto the lava of 1929. |
| 1 Aug 1930 | 1 Oct 1930 | 61 | A | ||
| 2 Oct 1930 | 9 Nov 1930 | 38 | IE effusive | 1 | Outflow to E. |
| 10 Nov 1930 | 31 May 1933 | 933 | A | Stronger activity during Apr-May 1933. | |
| 1 Jun 1933 | 19 Nov 1934 | 536 | IE effusive | 1-2 | On 1 Jun, collapse of conelet with outflow to NE |
| 20 Nov 1934 | 11 Feb 1935 | 83 | A | On 30 Nov 34, intracrateric lava flow. | |
| 12 Feb 1935 | 31 Mar 1935 | 47 | IE effusive | 1 | Lava ouflow on 12 Feb to E. |
| 1 Apr 1935 | 8 Jul 1935 | 98 | A | ||
| 8 Jul 1935 | 21 Aug 1935 | 44 | IE effusive | 1- | Fracturing of the conelet and lava outflow starting on 13 Jul into Valle dell'Inferno. |
| 22 Aug 1935 | 27 Mar 1936 | 218 | A | Intracrateric lava flow on 8 Nov 1935 and 23 Feb 1936. | |
| 28 Mar 1936 | 24 Sep 1936 | 180 | IE effusive | 1 | Fracturing of the conelet and lava outflow on 3 Apr. On 28 Apr, new outflow to E into Valle dell'Inferno. |
| 24 Sep 1936 | 3 Jun 1937 | 252 | A | Sep-Dec 1936, intracrateric lava. | |
| 4 Jun 1937 | 7 Jul 1937 | 33 | IE effusive | 0 | Lava outflow into Valle dell'Inferno. |
| 8 Jul 1937 | 7 Aug 1939 | 760 | A | Intracrateric lava since 10 Jan 1938 and from 30 Aug until 9 Jan 1939. On 9 Jan, fracturing of conelet and new lava flow. | |
| 8 Aug 1939 | 9 Aug 1939 | 1 | IE effusive | 0 | Lava outflow into Valle dell'Inferno. |
| 10 Aug 1939 | 25 Jun 1940 | 320 | A | ||
| 26 Jun 1940 | 31 Jul 1940 | 35 | IE effusive | 0 | Fracturing of conelet and lava outflow into Atrio del Cavallo, until end of Jul. |
| 1 Aug 1940 | 21 Oct 1941 | 446 | A | Continuous intracrateric lava during Aug-Oct and until 14 Nov, again from 25 Dec 1940 to 6 Jan 1941. | |
| 22 Oct 1941 | 15 Dec 1942 | 419 | IE effusive | 1-2 | New intracrateric lava outflowing on 23 Oct 1941. On the 26th, the lava flow has travelled 1,5 km from the crater rim. 1 Nov, collapse of conelet and new outflow to S, SSE and ESE. On 10 Jan 1942, the lava flow is at 900 m asl forming two small shields on the southern side; at the beginning of Jul, the lava front is at 600 m asl. |
| 16 Dec 1942 | 5 Jan 1944 | 385 | A | ||
| 6 Jan 1944 | 23 Feb 1944 | 48 | IE effusive | 0 | On 6 Jan 1944, fracturing of the conelet and lava overflowing onto W flank. |
| 24 Feb 1944 | 17 Mar 1944 | 22 | A | Mild activity | |
| 18 Mar 1944 | 4 Apr 1944 | 17 | FE (1944) effusive explosive volume = 10 x 10^6 m^3 lava | 3 | On 13 Mar, collapse of the conelet; 14 Mar, moderate explosive activity; 18 Mar, new collapse of conelet; that day at 1630, lava flow overflows to N ; at 2230, the velocity in the Valle dell'Inferno is about 10 m/h. At 2300, outflow to W. New lava flow to SW at 1100 on the 19th. Northern flow into Fosso della Vetrana. New flow into Fosso della Vetrana. On the 21st at 1300-1400: San Sebastiano and Massa are reached (and later partially destroyed) by the lava flow. Velocity of the lava: about 50-100 m/h. 21 Mar at 1700 - Lava fountains: I fountain 1715-1735, II fountain 2010-2030, III fountain 2200-2225; 22 Mar IV fountain 0140-0210, V fountain 0345-0403, VI fountain 0535-0615, VII fountain 0630-0705, VIII fountain, 0731-1750. At 0900 fall of scoriae of 500-1000 gm on Poggiomarino. Since 1000, scoria fall on S. Giuseppe At 1248, the lava fountain turns ashy with a sustained column 6-7 km asl high, small glowing avalanches. At 2000, ash-fall mixed with water on S. Giuseppe. 2100: discrete explosions from two different craters (two eruptive columns). 23 Mar, explosions and ash fall on Torre del Greco; lapilli embedded in ice (S. Giuseppe). Seismic crisis between 1100 and 1200. At 1400, red lapilli and loose crystals fall on Poggiomarino. 24 People killed by tephra falls. The new crater has a volume of 25 x 10^6 m^3 and is 300 m deep |
| 5 Apr 1944 | 1 Jul 1996> | >18885 | R | ||
TORNA ALLA PRIMA PAGINA VESUVIO
