Earthquake with magnitude of ML 1.0 on date 21-09-2021 and time 00:40:06 (Italy) in region 4 km S Campello sul Clitunno (PG)

A magnitude ML 1.0 earthquake occured in region: 4 km S Campello sul Clitunno (PG), on

  • 20-09-2021 22:40:06 (UTC)
  • 21-09-2021 00:40:06 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.788, 12.765 at 14 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 4 2442 2442
Spoleto PG 6 38218 40660
Vallo di Nera PG 8 364 41024
Sant'Anatolia di Narco PG 8 564 41588
Castel Ritaldi PG 9 3278 44866
Scheggino PG 10 461 45327
Trevi PG 10 8469 53796
Cerreto di Spoleto PG 13 1075 54871
Montefalco PG 15 5679 60550
Giano dell'Umbria PG 16 3846 64396
Poggiodomo PG 16 117 64513
Sellano PG 18 1079 65592
Ferentillo TR 19 1913 67505
Foligno PG 19 57155 124660
Massa Martana PG 20 3770 128430

Municipalities with at least 50000 inhabitants

An earthquake occurred to
19 Km S of Foligno (57155 inhabitants)
27 Km NE of Terni (111501 inhabitants)
47 Km SE of Perugia (166134 inhabitants)
68 Km NE of Viterbo (67173 inhabitants)
71 Km NW of L'Aquila (69753 inhabitants)
78 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 1.0 2021-09-20
22:40:06
42.788 12.7647 14 2021-09-20
23:01:39
Sala Sismica INGV-Roma 95677811
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-20 22:40:06 ± 0.16
Latitude 42.7880 ± 0.0045
Longitude 12.7647 ± 0.0061
Depth (km) 14 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 95677811

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 428
Semi-minor axis of confidence ellipse (meter) 411
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 36
Circular confidence region, given by single value of horizontal uncertainty (meter) 430
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 141
Number of associated phases, regardless of their use for origin computation 20
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.12
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.34264
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 6
Magnitude information

ML:1

Field Value
Value 1
Uncertainty 0.1
Num. used stations 4
Type of magnitude ML
Reference to an origin 95677811
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-20 23:01:39
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MSSA.HHZ. 2021-09-20T22:41:38.47 3.0 undecidable manual Sg 8.42 0
IV.NDIM.HHZ. 2021-09-20T22:41:12.74 3.0 undecidable manual Sn -9.99 0
IV.PAOL.HHZ. 2021-09-20T22:40:50.98 3.0 undecidable manual Sg -1.87 0
IV.PARC.HHZ. 2021-09-20T22:40:50.89 3.0 undecidable manual Sg 2.85 0
IV.MSSA.HHZ. 2021-09-20T22:40:49.58 3.0 undecidable manual Pg 0.19 0
IV.VULT.HHZ. 2021-09-20T22:40:34.61 3.0 negative manual Pg -3.2 0
OT.OT17.EHZ. 2021-09-20T22:40:33.28 3.0 negative manual Pg 1.97 0
IV.PAOL.HHZ. 2021-09-20T22:40:29.46 3.0 undecidable manual Pg 0.97 0
IV.FDMO.HHZ. 2021-09-20T22:40:19.89 0.6 undecidable manual S 43 0.3426 96 0.4 45
IV.NRCA.HHZ. 2021-09-20T22:40:17.00 0.6 undecidable manual S 80 0.2599 100 -0.07 49
IV.ASSB.HHZ. 2021-09-20T22:40:17.33 0.6 undecidable manual S 343 0.2662 99 0.09 49
IV.CESI.HHZ. 2021-09-20T22:40:16.35 0.6 undecidable manual S 25 0.2401 101 -0.12 48
IV.MOMA.HHZ. 2021-09-20T22:40:13.67 0.3 undecidable manual S 276 0.1439 117 -0.09 73
IV.FDMO.HHZ. 2021-09-20T22:40:13.99 1.0 positive manual P 43 0.3426 96 -0.15 24
IV.GAVE.EHZ. 2021-09-20T22:40:13.50 0.6 undecidable manual S 135 0.1349 119 -0.04 50
IV.ASSB.HHZ. 2021-09-20T22:40:12.87 0.6 positive manual P 343 0.2662 99 0.03 49
IV.NRCA.HHZ. 2021-09-20T22:40:12.65 0.1 undecidable manual P 80 0.2599 100 -0.1 97
IV.CESI.HHZ. 2021-09-20T22:40:12.27 0.6 undecidable manual P 25 0.2401 101 -0.13 48
IV.GAVE.EHZ. 2021-09-20T22:40:10.79 0.1 undecidable manual P 135 0.1349 119 0.08 100
IV.MOMA.HHZ. 2021-09-20T22:40:10.85 0.6 undecidable manual P 276 0.1439 117 0.02 50
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.GAVE.EHE. ML:1 8.565E-5 1.86 AML other m 2021-09-20T22:40:14.95
IV.GAVE.EHN. ML:0.9 6.755E-5 0.14 AML other m 2021-09-20T22:40:14.78
IV.NRCA.HHN. ML:1.1 5.395E-5 0.1 AML other m 2021-09-20T22:40:17.06
IV.NRCA.HHE. ML:0.8 3.175E-5 0.82 AML other m 2021-09-20T22:40:18.73
IV.SSFR.HNE. ML:2.6 0.00063745 0.44 AML other m 2021-09-20T22:40:43.43
IV.SSFR.HNN. ML:0 0.00124 0.84 AML other m 2021-09-20T22:40:44.42
OT.OT17.EHN. ML:0 0.0004715 0.98 AML other m 2021-09-20T22:41:00.30
OT.OT17.EHE. ML:0 0.0004315 0.74 AML other m 2021-09-20T22:41:06.22
IV.PARC.HHN. ML:0 3.17E-5 0.42 AML other m 2021-09-20T22:41:13.46
IV.PARC.HHE. ML:0 3.305E-5 0.42 AML other m 2021-09-20T22:41:16.29
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