Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 08-10-2021 and time 00:25:29 (Italy) in region 4 km SE Castel Ritaldi (PG)

A magnitude ML 1.2 earthquake occured in region: 4 km SE Castel Ritaldi (PG), on

  • 07-10-2021 22:25:29 (UTC)
  • 08-10-2021 00:25:29 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7900, 12.6940 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.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Castel Ritaldi PG 4 3278 3278
Spoleto PG 7 38218 41496
Campello sul Clitunno PG 8 2442 43938
Giano dell'Umbria PG 11 3846 47784
Trevi PG 11 8469 56253
Montefalco PG 12 5679 61932
Sant'Anatolia di Narco PG 13 564 62496
Massa Martana PG 14 3770 66266
Vallo di Nera PG 14 364 66630
Scheggino PG 14 461 67091
Acquasparta TR 16 4778 71869
Gualdo Cattaneo PG 17 6155 78024
Bevagna PG 18 5081 83105
Foligno PG 19 57155 140260
Cerreto di Spoleto PG 19 1075 141335

Municipalities with at least 50000 inhabitants

An earthquake occurred to
19 Km S of Foligno (57155 inhabitants)
26 Km N of Terni (111501 inhabitants)
43 Km SE of Perugia (166134 inhabitants)
64 Km NE of Viterbo (67173 inhabitants)
76 Km NW of L'Aquila (69753 inhabitants)
84 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
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		ML 1.2 2021-10-07
22:25:29		 42.7905 12.6942 10 2021-10-07
22:31:35		 Sala Sismica INGV-Roma 96333571
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-07 22:25:29 ± 0.09
Latitude 42.7905 ± 0.0054
Longitude 12.6942 ± 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 96333571

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 730
Semi-minor axis of confidence ellipse (meter) 547
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 233
Circular confidence region, given by single value of horizontal uncertainty (meter) 730.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 112
Number of associated phases, regardless of their use for origin computation 19
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.22
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.31117
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 6
Magnitude information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.0
Num. used stations 2
Type of magnitude ML
Reference to an origin 96333571
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-07 22:31:35
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.RNI2.HHZ. 2021-10-07T22:26:24.48 3.0 undecidable manual Sg 3.92 0
IV.NDIM.HHZ. 2021-10-07T22:26:14.41 3.0 undecidable manual Sn -1.81 0
ST.GAGG.HHZ. 2021-10-07T22:26:11.70 3.0 undecidable manual Pg 4.74 0
IV.RCAV.EHZ. 2021-10-07T22:26:05.67 3.0 undecidable manual Sg 2.37 0
IV.CADC.EHZ. 2021-10-07T22:26:05.52 3.0 positive manual Pg 3.98 0
IV.MURB.HNZ. 2021-10-07T22:25:47.41 3.0 undecidable manual Sg 2.78 0
IV.NRCA.HHZ. 2021-10-07T22:25:41.24 0.6 undecidable manual S 82 34.5432 50 -0.29 46
IV.ASSB.HHZ. 2021-10-07T22:25:40.34 0.6 undecidable manual S 354 28.1496 50 0.52 44
IV.CESI.HHZ. 2021-10-07T22:25:40.00 0.6 undecidable manual S 36 29.2485 50 -0.14 48
IV.ARRO.EHZ. 2021-10-07T22:25:39.12 0.6 undecidable manual S 166 24.1536 50 0.35 47
IV.MOCL.EHZ. 2021-10-07T22:25:37.57 3.0 undecidable manual P -2.35 0
IV.GAVE.EHZ. 2021-10-07T22:25:37.38 0.6 undecidable manual S 124 19.5693 118 0.03 50
IV.NRCA.HHZ. 2021-10-07T22:25:36.39 0.1 undecidable manual P 82 34.5432 50 -0.13 96
IV.ASSB.HHZ. 2021-10-07T22:25:35.80 1.0 negative manual P 354 28.1496 50 0.27 24
IV.CESI.HHZ. 2021-10-07T22:25:35.66 0.1 undecidable manual P 36 29.2485 50 -0.06 98
IV.ARRO.EHZ. 2021-10-07T22:25:34.68 0.1 undecidable manual P 166 24.1536 50 -0.24 95
IV.MOMA.HHZ. 2021-10-07T22:25:34.61 0.6 undecidable manual S 278 10.1787 135 -0.08 51
IV.GAVE.EHZ. 2021-10-07T22:25:34.40 0.1 undecidable manual P 124 19.5693 118 0.29 95
IV.MOMA.HHZ. 2021-10-07T22:25:32.44 0.1 undecidable manual P 278 10.1787 135 -0.13 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MOMA.HHE. ML:1.2 0.0002105 0.54 AML other m 2021-10-07T22:25:35.29
IV.MOMA.HHN. ML:1.2 0.000195 0.42 AML other m 2021-10-07T22:25:36.47
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