Earthquake with magnitude of ML 1.7 on date 26-08-2021 and time 14:56:35 (UTC) 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) 42.792, 12.728 at 10 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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.

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 6 38218 43938
Trevi PG 10 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 16 1075 64396
Massa Martana PG 17 3770 68166
Foligno PG 18 57155 125321
Bevagna PG 19 5081 130402
Acquasparta TR 19 4778 135180
Gualdo Cattaneo PG 19 6155 141335
Poggiodomo PG 19 117 141452
Sellano PG 20 1079 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)
88 Km N of Guidonia Montecelio (88673 inhabitants)
92 Km N of Tivoli (56533 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
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 ± 0.07
Latitude 42.7923 ± 0.0063
Longitude 12.7280 ± 0.0086
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 94668681

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 799
Semi-minor axis of confidence ellipse (meter) 465
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 226
Circular confidence region, given by single value of horizontal uncertainty (meter) 800
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 80
Number of associated phases, regardless of their use for origin computation 24
Number of defining phases 23
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.28
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.45955
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 12
Magnitude information

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 Takeoff_angle Residual Weight
IV.BOSL.HHZ. 2021-08-26T14:57:01.24 3.0 undecidable manual P 5.97 0
IV.CSP1.EHZ. 2021-08-26T14:56:52.81 0.1 undecidable manual S 49 0.4596 50 0.76 77
IV.MC2.EHZ. 2021-08-26T14:56:49.63 0.1 undecidable manual S 70 0.3579 50 0.59 84
IV.LNSS.HHZ. 2021-08-26T14:56:47.04 0.1 undecidable manual S 129 0.2977 50 -0.21 94
IV.ASSB.HHZ. 2021-08-26T14:56:46.13 0.1 undecidable manual S 349 0.2554 50 0.14 96
IT.MTCL.HGZ. 2021-08-26T14:56:46.63 0.3 undecidable manual S 45 0.2833 50 -0.19 71
IV.NRCA.HHZ. 2021-08-26T14:56:46.63 0.3 undecidable manual S 82 0.286 50 -0.28 69
IV.CSP1.EHZ. 2021-08-26T14:56:45.05 0.1 undecidable manual P 49 0.4596 50 -0.08 93
IV.CESI.HHZ. 2021-08-26T14:56:45.93 0.1 undecidable manual S 31 0.2491 50 0.13 96
IV.CESX.HHZ. 2021-08-26T14:56:44.99 0.3 undecidable manual S 209 0.2113 113 0.49 67
IV.MC2.EHZ. 2021-08-26T14:56:43.28 0.1 undecidable manual P 70 0.3579 50 -0.12 94
IV.MML1.EHZ. 2021-08-26T14:56:43.70 0.1 undecidable manual P 29 0.3669 50 0.15 93
IV.GAVE.HNE. 2021-08-26T14:56:42.82 0.3 undecidable manual S 129 0.1574 119 0.17 73
IV.CESI.HHZ. 2021-08-26T14:56:41.33 0.1 undecidable manual P 31 0.2491 50 -0.2 95
IV.MOMA.HNE. 2021-08-26T14:56:41.24 0.1 undecidable manual S 276 0.116 127 -0.07 100
IV.NRCA.HHZ. 2021-08-26T14:56:41.82 0.3 negative manual P 82 0.286 50 -0.35 68
IV.LNSS.HHZ. 2021-08-26T14:56:41.88 1.0 undecidable manual P 129 0.2977 50 -0.48 22
IV.ASSB.HHZ. 2021-08-26T14:56:41.29 0.3 undecidable manual P 349 0.2554 50 -0.35 69
IT.MTCL.HGZ. 2021-08-26T14:56:41.81 0.1 undecidable manual P 45 0.2833 50 -0.3 92
IT.GNU.HGE. 2021-08-26T14:56:41.40 0.3 undecidable manual S 276 0.116 127 0.09 74
IV.CESX.HHZ. 2021-08-26T14:56:40.96 0.1 undecidable manual P 209 0.2113 113 0.19 96
IV.GAVE.HNE. 2021-08-26T14:56:39.52 0.1 undecidable manual P 129 0.1574 119 -0.19 97
IT.GNU.HGE. 2021-08-26T14:56:38.81 0.1 undecidable manual P 276 0.116 127 -0.12 99
IV.MOMA.HNE. 2021-08-26T14:56:38.88 0.1 undecidable manual P 276 0.116 127 -0.05 100
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:1.4 0.0001152 1.3 AML other m 2021-08-26T14:56:46.28
IV.NRCA.HHE. ML:1.8 0.000317 1.4 AML other m 2021-08-26T14:56:48.70
IV.NRCA.HHN. ML:1.8 0.000276 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 0.000265 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