IEDA / DECADE Detail

Data from the Global Volcanism Program of the Smithsonian Institution

Details for: Atacazo

Atacazo stratovolcano, located 20 km south of Quito, is seen here from the west along the road to Guayaquil. The volcano contains a summit caldera that is partially filled by lava domes of Holocene age. Lava domes are also found on the SE flank. The only dated Holocene eruption took place about 2400 years ago, forming the Ninahuilca lava domes, the peaks below the center horizon. Photo by John Ewert, 1992 (U.S. Geological Survey).

Volcano Number:	352021
Volcano Name:	Atacazo
Country:	Ecuador
Volcano Type:	Stratovolcano
Last Eruption:	320 BCE
Elevation:	4463m
Tectonic Setting:	Subduction zone / Continental crust (> 25 km)
Pop. within 5km:	449
Pop. within 10km:	212988
Pop. within 30km:	1837303
Pop. within 100km:	3769593
Latitude:	-0.353
Longitude:	-78.617

Eruption Data from the Global Volcanism Program of the Smithsonian Institution

Volcano Number	Volcano Name	Eruption Number	Activity Type	Explosivity Index Max	Explosivity Index Modifier	Activity Area	Activity Unit	Start Evidence Method	Start Date
352021	Atacazo	11450	Confirmed Eruption	4	P	La Cocha II dome	N3 tephra	Radiocarbon (uncorrected)	-6910
352021	Atacazo	11451	Confirmed Eruption	4	P	Arenal II dome	N4 tephra	Radiocarbon (uncorrected)	-3490
352021	Atacazo	11452	Confirmed Eruption	5		Ninahuilca Chico I dome	N5 tephra	Radiocarbon (uncorrected)	-2490
352021	Atacazo	11453	Confirmed Eruption	5		Ninahuilca Chico II dome	N6 tephra	Radiocarbon (uncorrected)	-320

Emissions Data from the Global Volcanism Program of the Smithsonian Institution

Sorry. No emissions data found for this volcano.

Data from the Earthchem Library

Sorry. No data exist for this volcano in the EarthChem Library.

Data from the Earthchem Portal

Sample ID	LINK	Method	Material	Rock Class	Rock Name	SiO₂ WT%	TiO₂ WT%	Al₂O₃ WT%	Fe₂O₃ WT%	Fe₂O₃ Total WT%	FeO WT%	FeO Total WT%	MnO WT%	MgO WT%	CaO WT%	Na₂O WT%	K₂O WT%	P₂O₅ WT%	Total WT%	Ba PPM	Be PPM	Co PPM	Cr PPM	Cs PPM	Dy PPM	Nb PPM	Ni PPM	Rb PPM	Sc PPM	Sr PPM	U PPM	V PPM	Y PPM	Zr PPM	⁸⁷Sr / ⁸⁶Sr RATIO	¹⁴³Nd / ¹⁴⁴Nd RATIO
ATAC 070	DETAILS	NOT GIVEN	Rock	Igneous Felsic Volcanic	Dacite	66.49	0.63	15.66	5.36		4.83		0.06	1.55	4.64	4.44	1.02	0.14	100	520	0.82		20		1.45	3.3	7.5	19	6.2	402		112	7	68
ATAC 046A	DETAILS	NOT GIVEN	Rock	Igneous Intermediate Volcanic	Andesite	58.65	0.65	16.11	8.06		7.25		0.12	5.21	6.81	3.4	0.85	0.13	100	400	0.64		215		2.65	2.9	56	17	22.5	363		186	15.6	80
ATAC 022E3	DETAILS	NOT GIVEN	Rock	Igneous Felsic Volcanic	Dacite	65.69	0.52	16.53	5.15		4.64		0.06	1.67	4.85	4.23	1.17	0.12	100	650	0.81		12		1.5	3.3	5	23.6	6.2	439		105	7.3	74
ATAC 022E1	DETAILS	MS	Rock	Igneous Felsic Volcanic	Dacite																														0.704186	0.51288
ATAC 022E1	DETAILS	NOT GIVEN	Rock	Igneous Felsic Volcanic	Dacite	66	0.53	16.45	5.22		4.7		0.06	1.66	4.73	4.03	1.21	0.11	100	640	0.77		12		1.45	3.3	5	24	6	430		103	7	73
ATAC 023A	DETAILS	NOT GIVEN	Rock	Igneous Felsic Volcanic	Dacite	65.84	0.53	16.38	5.2		4.68		0.06	1.62	4.76	4.25	1.22	0.13	100	675	0.82		12.5		1.4	3.4	5	24.5	6	435		107	7.1	72
ATAC 035	DETAILS	MS	Rock	Igneous Intermediate Volcanic	Andesite																														0.704275	0.512845
ATAC 035	DETAILS	NOT GIVEN	Rock	Igneous Intermediate Volcanic	Andesite	62.88	0.71	17.95	6.21		5.58		0.07	1.88	5.14	4.05	0.94	0.18	100	630	0.87		13		1.6	4.4	5	17.5	7	492		122	7.6	94
ATAC 012A	DETAILS	MS	Rock	Igneous Intermediate Volcanic	Andesite																														0.704257	0.512854
ATAC 012A	DETAILS	NOT GIVEN	Rock	Igneous Intermediate Volcanic	Andesite	57.28	0.67	16.5	8.48		7.63		0.12	5.42	7.12	3.52	0.76	0.14	100	355	0.59		238		2.2	2.4	62	14.3	22	422		189	12.9	66
ATAC 041C	DETAILS	NOT GIVEN	Rock	Igneous Felsic Volcanic	Dacite	65.6	0.54	16.5	5.23		4.7		0.06	1.67	4.87	4.2	1.19	0.13	100	660	0.81		11		1.3	3.2	6	24	5.8	434		102	7.2	72
ATAC 024H	DETAILS	NOT GIVEN	Rock	Igneous Felsic Volcanic	Dacite	65.68	0.62	16.04	5.52		4.97		0.06	1.67	4.96	4.14	1.15	0.14	100	610	0.86		15		1.55	4.4	5	21.2	6.5	444		115	7.7	71
ATAC 101-Ie	DETAILS	NOT GIVEN	Rock	Igneous Intermediate Volcanic	Andesite	54.53	0.69	15.49	9.25		8.33		0.13	7.62	9.17	2.51	0.52	0.09	100	240	0.43		350		1.8	1.9	51	9.1	30	364		315	10.4	51
ATAC 101J	DETAILS	NOT GIVEN	Rock	Igneous Intermediate Volcanic	Andesite	55.91	0.74	15.9	8.9		8.01		0.13	6.32	7.97	3.16	0.83	0.14	100	360	0.66		250		2.65	3.1	41	9.6	24.5	390		210	14.9	76
ATAC 101J	DETAILS	MS	Rock	Igneous Intermediate Volcanic	Andesite																														0.704215
AT07	DETAILS	XRF	Rock	Igneous Intermediate Volcanic	Andesite	60.53	0.606	16.18				7.16	0.103	4	6.24	3.9	1.14	0.14	99.999	490						3.5	39	24	21	404		164	13	96
AT01	DETAILS	INAA	Rock	Igneous Intermediate Volcanic	Andesite																			0.44					20.4
AT01	DETAILS	TIMS	Rock	Igneous Intermediate Volcanic	Andesite																														0.704187	0.51285
AT01	DETAILS	XRF	Rock	Igneous Intermediate Volcanic	Andesite	59	0.65	17.05				7.18	0.11	4.25	7.05	3.68	0.89	0.12	99.98	384						2.9	38	19	24	362		166	16	91
ATAC 075	DETAILS	NOT GIVEN	Rock	Igneous Intermediate Volcanic	Andesite	60.83	0.63	16.14	7.44		6.7		0.1	3.72	6.69	3.34	0.97	0.14	100	550	0.7		120		3.05	3.5	28	23.6	20	355		178	17.5	90
ARCOC	DETAILS	INAA	Rock	Igneous Felsic Volcanic	Dacite																			0.69					9.3		0.53
ARCOC	DETAILS	XRF	Rock	Igneous Felsic Volcanic	Dacite	63.28	0.63	16.88				5.7	0.09	2.39	5.76	4.22	0.98	0.08	100	493						3	8	18	11	428		136	7	90
ATAC 061	DETAILS	MS	Rock	Igneous Intermediate Volcanic	Andesite																														0.704372	0.512822
ATAC 061	DETAILS	NOT GIVEN	Rock	Igneous Intermediate Volcanic	Andesite	60.89	0.61	15.93	7.52		6.77		0.1	4.13	6.1	3.54	1.04	0.14	100	510	0.72		170		2.05	3.2	46	21.6	18	379		175	11.2	80
ATAC 12C	DETAILS	ICPAES	Rock	Igneous Intermediate Volcanic	Andesite	60	0.6	15.95		6.96			0.1	3.31	5.6	3.29	1.02	0.13	96.96	505		20	108		2.2	3.4	20	25	14.5	349		155	12.2	90

123Next

Data from the SESAR Database

Sorry. No data exist for this volcano in the SESAR database.

Data from the MaGa Database

Sorry. No data exist for this volcano in the MaGa database.