Earthquake with magnitude of ML 1.0 on date 26-10-2021 and time 18:15:30 (UTC) in region 1 km NW Cerreto di Spoleto (PG)

A magnitude ML 1.0 earthquake occured in region: 1 km NW Cerreto di Spoleto (PG), on

  • 26-10-2021 18:15:30 (UTC)
  • 26-10-2021 20:15:30 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.826, 12.906 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
Cerreto di Spoleto PG 1 1075 1075
Vallo di Nera PG 7 364 1439
Sellano PG 7 1079 2518
Campello sul Clitunno PG 10 2442 4960
Sant'Anatolia di Narco PG 12 564 5524
Preci PG 12 724 6248
Poggiodomo PG 13 117 6365
Scheggino PG 14 461 6826
Trevi PG 14 8469 15295
Cascia PG 15 3217 18512
Norcia PG 16 4957 23469
Spoleto PG 17 38218 61687
Visso MC 19 1107 62794
Castel Ritaldi PG 19 3278 66072
Monteleone di Spoleto PG 20 599 66671

Municipalities with at least 50000 inhabitants

An earthquake occurred to
22 Km SE of Foligno (57155 inhabitants)
36 Km NE of Terni (111501 inhabitants)
52 Km SE of Perugia (166134 inhabitants)
66 Km NW of L'Aquila (69753 inhabitants)
68 Km W of Teramo (54892 inhabitants)
80 Km NE of Viterbo (67173 inhabitants)
93 Km N of Guidonia Montecelio (88673 inhabitants)
96 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 2021-10-26
18:15:30
42.8263 12.9057 11 2021-10-26
18:19:56
Sala Sismica INGV-Roma 97007721
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-26 18:15:30 ± 0.05
Latitude 42.8263 ± 0.0027
Longitude 12.9057 ± 0.0037
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 97007721

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 298
Semi-minor axis of confidence ellipse (meter) 276
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 218
Circular confidence region, given by single value of horizontal uncertainty (meter) 300
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 81
Number of associated phases, regardless of their use for origin computation 19
Number of defining phases 18
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.15
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.34354
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 9
Magnitude information

ML:1

Field Value
Value 1
Uncertainty 0.1
Num. used stations 6
Type of magnitude ML
Reference to an origin 97007721
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-26 18:19:56
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.SNTG.HHZ. 2021-10-26T18:15:45.07 3.0 undecidable manual S -0.71 0
IV.CSP1.EHZ. 2021-10-26T18:15:43.32 0.6 undecidable manual S 39 0.3435 50 0.08 48
IV.ASSB.HHZ. 2021-10-26T18:15:41.55 0.3 undecidable manual S 320 0.2815 50 0.15 71
IV.FDMO.HHZ. 2021-10-26T18:15:40.24 0.3 undecidable manual S 32 0.2482 50 -0.17 71
IV.LNSS.HHZ. 2021-10-26T18:15:40.14 0.6 undecidable manual S 156 0.2446 50 -0.14 48
IV.MC2.EHZ. 2021-10-26T18:15:40.03 0.3 undecidable manual S 68 0.2239 50 0.34 69
IV.MOMA.HHZ. 2021-10-26T18:15:40.20 0.3 undecidable manual S 265 0.2473 50 -0.16 72
IV.CESI.HHZ. 2021-10-26T18:15:38.09 0.6 undecidable manual S 360 0.1781 118 -0.13 49
IV.NRCA.HHZ. 2021-10-26T18:15:37.22 0.3 undecidable manual S 87 0.1529 122 -0.16 73
IV.CSP1.EHZ. 2021-10-26T18:15:37.80 1.0 negative manual P 39 0.3435 50 -0.04 24
IV.ASSB.HHZ. 2021-10-26T18:15:36.47 0.6 undecidable manual P 320 0.2815 50 -0.3 46
IV.GAVE.EHZ. 2021-10-26T18:15:36.85 0.6 undecidable manual S 184 0.134 125 0.08 50
IV.MOMA.HHZ. 2021-10-26T18:15:36.51 0.6 positive manual P 265 0.2473 50 0.33 46
IV.FDMO.HHZ. 2021-10-26T18:15:36.07 0.6 positive manual P 32 0.2482 50 -0.13 48
IV.LNSS.HHZ. 2021-10-26T18:15:36.01 0.1 undecidable manual P 156 0.2446 50 -0.12 96
IV.CESI.HHZ. 2021-10-26T18:15:35.05 0.3 undecidable manual P 360 0.1781 118 0.1 73
IV.MC2.EHZ. 2021-10-26T18:15:35.88 1.0 negative manual P 68 0.2239 50 0.09 24
IV.GAVE.EHZ. 2021-10-26T18:15:34.32 0.6 negative manual P 184 0.134 125 0.22 48
IV.NRCA.HHZ. 2021-10-26T18:15:34.48 0.1 positive manual P 87 0.1529 122 0.03 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.GAVE.EHE. ML:1 9.755E-5 0.12 AML other m 2021-10-26T18:15:37.21
IV.GAVE.EHN. ML:1 8.525E-5 0.48 AML other m 2021-10-26T18:15:37.15
IV.NRCA.HHN. ML:1.1 0.00010215 0.12 AML other m 2021-10-26T18:15:37.44
IV.NRCA.HHE. ML:0.9 6.42E-5 0.08 AML other m 2021-10-26T18:15:37.85
IV.CESI.HHE. ML:0.9 5.93E-5 0.32 AML other m 2021-10-26T18:15:38.46
IV.CESI.HHN. ML:1.2 0.00010825 0.26 AML other m 2021-10-26T18:15:38.36
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