Earthquake with magnitude of ML 1.1 on date 21-10-2021 and time 09:04:38 (Italy) in region 7 km SE Cerreto di Spoleto (PG)

A magnitude ML 1.1 earthquake occured in region: 7 km SE Cerreto di Spoleto (PG), on

  • 21-10-2021 07:04:38 (UTC)
  • 21-10-2021 09:04:38 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.79, 12.99 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 7 1075 1075
Cascia PG 8 3217 4292
Norcia PG 9 4957 9249
Poggiodomo PG 10 117 9366
Vallo di Nera PG 11 364 9730
Preci PG 11 724 10454
Sellano PG 12 1079 11533
Sant'Anatolia di Narco PG 14 564 12097
Scheggino PG 15 461 12558
Monteleone di Spoleto PG 16 599 13157
Campello sul Clitunno PG 18 2442 15599
Visso MC 18 1107 16706
Castelsantangelo sul Nera MC 18 281 16987

Municipalities with at least 50000 inhabitants

An earthquake occurred to
30 Km SE of Foligno (57155 inhabitants)
38 Km NE of Terni (111501 inhabitants)
59 Km NW of L'Aquila (69753 inhabitants)
60 Km W of Teramo (54892 inhabitants)
60 Km SE of Perugia (166134 inhabitants)
83 Km NE of Viterbo (67173 inhabitants)
90 Km N of Guidonia Montecelio (88673 inhabitants)
93 Km N of Tivoli (56533 inhabitants)
100 Km W of Montesilvano (53738 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 1.1 2021-10-21
07:04:38
42.79 12.99 10 2021-10-21
07:11:09
Sala Sismica INGV-Roma 96829121
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-21 07:04:38 ± 0.07
Latitude 42.7900 ± 0.0045
Longitude 12.9900 ± 0.0061
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 96829121

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 526
Semi-minor axis of confidence ellipse (meter) 235
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 133
Circular confidence region, given by single value of horizontal uncertainty (meter) 530
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 103
Number of associated phases, regardless of their use for origin computation 20
Number of defining phases 17
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
Epicentral distance of station farthest from the epicenter (degree) 0.30847
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 9
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.1
Num. used stations 6
Type of magnitude ML
Reference to an origin 96829121
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-21 07:11:09
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.LAV9.HHZ. 2021-10-21T07:05:00.66 3.0 negative manual P 0.02 0
IV.SACS.HHZ. 2021-10-21T07:04:55.03 3.0 undecidable manual P -0.09 0
IV.T1299.EHZ. 2021-10-21T07:04:53.46 3.0 undecidable manual P 0
IV.MOMA.HNE. 2021-10-21T07:04:51.15 0.6 undecidable manual S 273 0.3085 50 0.35 45
IV.MMO1.HNZ. 2021-10-21T07:04:49.43 0.6 undecidable manual S 66 0.2698 50 -0.23 47
IV.CESI.HHZ. 2021-10-21T07:04:48.01 0.6 undecidable manual S 344 0.2239 111 -0.12 48
IV.FDMO.HHZ. 2021-10-21T07:04:48.97 0.6 undecidable manual S 16 0.2563 50 -0.29 47
IV.MTCL.HGZ. 2021-10-21T07:04:47.23 0.6 undecidable manual S 100
IV.MC2.EHZ. 2021-10-21T07:04:46.97 0.3 undecidable manual S 50 0.1898 115 0.05 74
IV.LNSS.HHZ. 2021-10-21T07:04:46.61 0.6 undecidable manual S 169 0.1907 115 -0.35 46
IV.MOMA.HNE. 2021-10-21T07:04:45.49 0.1 undecidable manual P 273 0.3085 50 -0.28 92
IV.MMO1.HNZ. 2021-10-21T07:04:45.54 0.1 undecidable manual P 66 0.2698 50 0.43 90
IV.NRCA.HNZ. 2021-10-21T07:04:44.00 0.6 undecidable manual S 64 0.1007 131 -0.02 51
IV.CESI.HHZ. 2021-10-21T07:04:44.32 0.6 negative manual P 344 0.2239 111 0.09 49
IV.GAVE.EHZ. 2021-10-21T07:04:44.46 0.6 undecidable manual S 216 0.1205 126 -0.15 49
IV.FDMO.HHZ. 2021-10-21T07:04:44.77 0.6 negative manual P 16 0.2563 50 -0.11 48
IV.LNSS.HHZ. 2021-10-21T07:04:43.53 0.3 positive manual P 169 0.1907 115 -0.02 75
IV.MC2.EHZ. 2021-10-21T07:04:43.45 0.1 undecidable manual P 50 0.1898 115 -0.08 98
IV.GAVE.EHZ. 2021-10-21T07:04:42.45 0.1 positive manual P 216 0.1205 126 0.25 96
IV.NRCA.HNZ. 2021-10-21T07:04:41.94 0.1 undecidable manual P 64 0.1007 131 0.09 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.GAVE.EHE. ML:1.2 0.000149 1.6 AML other m 2021-10-21T07:04:44.13
IV.GAVE.EHN. ML:1.1 0.0001465 0.1 AML other m 2021-10-21T07:04:45.28
IV.LNSS.HHN. ML:1.1 8.875E-5 1.08 AML other m 2021-10-21T07:04:46.86
IV.LNSS.HHE. ML:1.2 0.00012385 0.1 AML other m 2021-10-21T07:04:46.85
IV.FDMO.HHN. ML:0.8 3.54E-5 0.3 AML other m 2021-10-21T07:04:49.24
IV.FDMO.HHE. ML:1.1 6.18E-5 0.2 AML other m 2021-10-21T07:04:49.15
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