Earthquake with magnitude of ML 0.9 on date 25-10-2021 and time 21:56:45 (Italy) in region 6 km SE Cerreto di Spoleto (PG)

A magnitude ML 0.9 earthquake occured in region: 6 km SE Cerreto di Spoleto (PG), on

  • 25-10-2021 19:56:45 (UTC)
  • 25-10-2021 21:56:45 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.774, 12.948 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 6 1075 1075
Vallo di Nera PG 7 364 1439
Poggiodomo PG 7 117 1556
Cascia PG 8 3217 4773
Sant'Anatolia di Narco PG 10 564 5337
Scheggino PG 12 461 5798
Norcia PG 12 4957 10755
Sellano PG 13 1079 11834
Monteleone di Spoleto PG 14 599 12433
Preci PG 14 724 13157
Campello sul Clitunno PG 15 2442 15599
Spoleto PG 18 38218 53817
Trevi PG 20 8469 62286

Municipalities with at least 50000 inhabitants

An earthquake occurred to
28 Km SE of Foligno (57155 inhabitants)
34 Km NE of Terni (111501 inhabitants)
59 Km SE of Perugia (166134 inhabitants)
60 Km NW of L'Aquila (69753 inhabitants)
63 Km W of Teramo (54892 inhabitants)
80 Km NE of Viterbo (67173 inhabitants)
88 Km N of Guidonia Montecelio (88673 inhabitants)
91 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 0.9 2021-10-25
19:56:45
42.7743 12.9477 10 2021-10-25
20:03:55
Sala Sismica INGV-Roma 96987831
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-25 19:56:45 ± 0.06
Latitude 42.7743 ± 0.0027
Longitude 12.9477 ± 0.0049
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96987831

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 411
Semi-minor axis of confidence ellipse (meter) 274
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 116
Circular confidence region, given by single value of horizontal uncertainty (meter) 410
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 194
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 11
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.09
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.36872
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 6
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 96987831
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-25 20:03:55
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.CAFI.HNZ. 2021-10-25T19:57:01.63 3.0 undecidable manual P -0.26 0
IV.FDMO.HHZ. 2021-10-25T19:56:56.14 0.3 undecidable manual S 21 0.2815 50 -0.03 74
IV.CESI.HHZ. 2021-10-25T19:56:54.77 0.3 undecidable manual S 352 0.2329 50 0.04 75
IV.MC2.EHZ. 2021-10-25T19:56:54.52 0.3 undecidable manual S 52 0.2239 50 0.05 75
IV.LNSS.HHZ. 2021-10-25T19:56:53.12 0.3 undecidable manual S 158 0.1844 117 -0.03 76
IV.CSP1.EHZ. 2021-10-25T19:56:53.15 0.3 undecidable manual P 31 0.3687 50 0.11 72
IV.NRCA.HHZ. 2021-10-25T19:56:51.43 0.3 undecidable manual S 64 0.1358 124 -0.1 75
IV.FDMO.HHZ. 2021-10-25T19:56:51.39 0.3 undecidable manual P 21 0.2815 50 -0.15 73
IV.MC2.EHZ. 2021-10-25T19:56:50.49 0.3 undecidable manual P 52 0.2239 50 -0.06 75
IV.CESI.HHZ. 2021-10-25T19:56:50.67 0.1 undecidable manual P 352 0.2329 50 -0.03 100
IV.LNSS.HHZ. 2021-10-25T19:56:49.81 0.3 undecidable manual P 158 0.1844 117 0.02 76
IV.NRCA.HHZ. 2021-10-25T19:56:48.98 0.1 undecidable manual P 64 0.1358 124 0.12 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.1 0.0001205 0.14 AML other m 2021-10-25T19:56:51.66
IV.NRCA.HHE. ML:1.3 0.000175 0.18 AML other m 2021-10-25T19:56:51.69
IV.LNSS.HHE. ML:1.2 0.0001212 0.12 AML other m 2021-10-25T19:56:53.63
IV.LNSS.HHN. ML:1 7.15E-5 0.52 AML other m 2021-10-25T19:56:54.51
IV.CESI.HHE. ML:0.4 1.6721798E-5 0.128 AML other m 2021-10-25T19:56:55.19
IV.CESI.HHN. ML:0.7 2.86135E-5 0.2176 AML other m 2021-10-25T19:56:54.94
IV.FDMO.HHE. ML:0.6 2.091078E-5 0.2176 AML other m 2021-10-25T19:56:56.26
IV.FDMO.HHN. ML:0.6 2.033738E-5 0.2688 AML other m 2021-10-25T19:56:56.26
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