Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 26-08-2021 and time 16:56:35 (Italy) in region 5 km SW Campello sul Clitunno (PG)

A magnitude ML 1.7 earthquake occured in region: 5 km SW Campello sul Clitunno (PG), on

  • 26-08-2021 14:56:35 (UTC)
  • 26-08-2021 16:56:35 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7970, 12.7330 at 10 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Campello sul Clitunno PG 5 2442 2442
Castel Ritaldi PG 6 3278 5720
Spoleto PG 7 38218 43938
Trevi PG 9 8469 52407
Sant'Anatolia di Narco PG 11 564 52971
Vallo di Nera PG 11 364 53335
Scheggino PG 12 461 53796
Montefalco PG 13 5679 59475
Giano dell'Umbria PG 13 3846 63321
Cerreto di Spoleto PG 15 1075 64396
Massa Martana PG 17 3770 68166
Foligno PG 18 57155 125321
Bevagna PG 18 5081 130402
Poggiodomo PG 19 117 130519
Sellano PG 19 1079 131598
Acquasparta TR 19 4778 136376
Gualdo Cattaneo PG 19 6155 142531
Ferentillo TR 20 1913 144444

Municipalities with at least 50000 inhabitants

An earthquake occurred to
18 Km S of Foligno (57155 inhabitants)
27 Km N of Terni (111501 inhabitants)
45 Km SE of Perugia (166134 inhabitants)
66 Km NE of Viterbo (67173 inhabitants)
74 Km NW of L'Aquila (69753 inhabitants)
81 Km W of Teramo (54892 inhabitants)
89 Km N of Guidonia Montecelio (88673 inhabitants)
93 Km N of Tivoli (56533 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000 		ML 1.7 2021-08-26
14:56:35		 42.7967 12.733 10 2021-12-29
11:12:52		 Bollettino Sismico Italiano INGV 97831441
Reviewed
Rev100 		ML 1.7 2021-08-26
14:56:35		 42.7923 12.728 10 2021-08-26
15:05:21		 Sala Sismica INGV-Roma 94668681
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-26 14:56:35 ± 0.05
Latitude 42.7967 ± 0.0045
Longitude 12.7330 ± 0.0049
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 97831441

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 563
Semi-minor axis of confidence ellipse (meter) 338
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 220
Circular confidence region, given by single value of horizontal uncertainty (meter) 560.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 63
Number of associated phases, regardless of their use for origin computation 26
Number of defining phases 26
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.11961
Epicentral distance of station farthest from the epicenter (degree) 0.46945
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 14
Magnitudes information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 97831441
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-11-26 17:16:42

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 94668681
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-26 15:05:21
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CSP1.EHZ. 2021-08-26T14:56:52.38 0.6 undecidable manual S 49 50.4162 50 0.61 41
IV.MC2.EHZ. 2021-08-26T14:56:49.12 0.6 undecidable manual S 71 39.2274 50 0.34 46
IV.LNSS.HHZ. 2021-08-26T14:56:46.79 0.6 undecidable manual S 131 33.0447 50 -0.34 46
IT.MTCL.HGZ. 2021-08-26T14:56:46.63 0.3 undecidable manual S 45 30.747 50 0.09 73
IV.NRCA.HHZ. 2021-08-26T14:56:46.57 0.3 undecidable manual S 82 31.2465 50 -0.1 73
IV.ASSB.HHZ. 2021-08-26T14:56:45.72 0.6 undecidable manual S 348 27.9498 50 -0.06 49
IV.MGAB.HHZ. 2021-08-26T14:56:45.35 0.3 undecidable manual P 285 52.1034 50 0.16 69
IV.CESI.HHZ. 2021-08-26T14:56:45.49 0.6 undecidable manual S 31 26.9508 50 -0.04 50
IV.ARRO.EHZ. 2021-08-26T14:56:44.86 0.6 undecidable manual S 174 24.2535 112 0.21 48
IV.CSP1.EHZ. 2021-08-26T14:56:44.98 0.3 undecidable manual P 49 50.4162 50 0.05 71
IV.CESX.HHZ. 2021-08-26T14:56:44.40 0.6 undecidable manual S 210 24.0537 112 -0.18 48
IV.MC2.EHZ. 2021-08-26T14:56:43.18 0.3 undecidable manual P 71 39.2274 50 -0.02 73
IV.MML1.EHZ. 2021-08-26T14:56:43.48 0.3 undecidable manual P 29 40.1265 50 0.14 71
IV.GAVE.HNE. 2021-08-26T14:56:42.34 0.3 undecidable manual S 131 17.4714 119 -0.19 73
IT.GNU.HGE. 2021-08-26T14:56:41.25 0.3 undecidable manual S 273 13.2756 126 -0.05 76
IV.NRCA.HHZ. 2021-08-26T14:56:41.77 0.3 undecidable manual P 82 31.2465 50 -0.21 71
IV.MOMA.HNE. 2021-08-26T14:56:41.22 0.6 undecidable manual S 274 13.2756 126 -0.08 50
IV.ASSB.HHZ. 2021-08-26T14:56:41.27 0.1 undecidable manual P 348 27.9498 50 -0.2 96
IV.LNSS.HHZ. 2021-08-26T14:56:41.94 0.3 undecidable manual P 131 33.0447 50 -0.31 70
IV.CESI.HHZ. 2021-08-26T14:56:41.28 0.1 undecidable manual P 31 26.9508 50 -0.04 99
IV.ARRO.EHZ. 2021-08-26T14:56:41.58 0.3 undecidable manual P 174 24.2535 112 0.76 61
IT.MTCL.HGZ. 2021-08-26T14:56:41.80 0.3 undecidable manual P 45 30.747 50 -0.1 73
IV.CESX.HHZ. 2021-08-26T14:56:40.95 0.3 undecidable manual P 210 24.0537 112 0.18 73
IV.GAVE.HNE. 2021-08-26T14:56:39.52 0.1 undecidable manual P 131 17.4714 119 -0.07 100
IT.GNU.HGE. 2021-08-26T14:56:38.90 0.3 undecidable manual P 273 13.2756 126 0.02 76
IV.MOMA.HNE. 2021-08-26T14:56:38.76 0.1 undecidable manual P 274 13.2756 126 -0.12 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESI.HHN. ML:1.7 0.0002495 0.48 AML other m 2021-08-26T14:56:46.23
IV.ASSB.HHE. ML:1.5 0.0001525 0.36 AML other m 2021-08-26T14:56:46.58
IV.ASSB.HHN. ML:1.3 0.0001152 1.3 AML other m 2021-08-26T14:56:46.28
IV.NRCA.HHE. ML:1.8 0.00031699999999999995 1.4 AML other m 2021-08-26T14:56:48.70
IV.NRCA.HHN. ML:1.8 0.00027600000000000004 0.14 AML other m 2021-08-26T14:56:48.42
IV.CESI.HHE. ML:1.3 0.00010175 1.48 AML other m 2021-08-26T14:56:49.06
IV.CSP1.EHE. ML:1.8 0.0001795 1.56 AML other m 2021-08-26T14:56:52.14
IV.CSP1.EHN. ML:2.0 0.000265 1.46 AML other m 2021-08-26T14:56:55.13
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download