Earthquake with magnitude of ML 0.5 on date 23-10-2021 and time 02:54:24 (UTC) in region 4 km N Preci (PG)

A magnitude ML 0.5 earthquake occured in region: 4 km N Preci (PG), on

  • 23-10-2021 02:54:24 (UTC)
  • 23-10-2021 04:54:24 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.915, 13.046 at 13 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
Preci PG 4 724 724
Visso MC 4 1107 1831
Ussita MC 8 444 2275
Castelsantangelo sul Nera MC 9 281 2556
Monte Cavallo MC 10 145 2701
Sellano PG 10 1079 3780
Fiordimonte MC 14 202 3982
Norcia PG 14 4957 8939
Pieve Torina MC 15 1458 10397
Cerreto di Spoleto PG 15 1075 11472
Fiastra MC 16 559 12031
Acquacanina MC 17 121 12152
Pievebovigliana MC 17 866 13018
Bolognola MC 17 142 13160
Muccia MC 19 915 14075
Serravalle di Chienti MC 19 1070 15145

Municipalities with at least 50000 inhabitants

An earthquake occurred to
28 Km E of Foligno (57155 inhabitants)
51 Km NE of Terni (111501 inhabitants)
58 Km E of Perugia (166134 inhabitants)
61 Km W of Teramo (54892 inhabitants)
69 Km NW of L'Aquila (69753 inhabitants)
87 Km SW of Ancona (100861 inhabitants)
95 Km NE of Viterbo (67173 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 0.5 2021-10-23
02:54:24
42.9148 13.0462 13 2021-10-23
03:20:08
Sala Sismica INGV-Roma 96898641
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-23 02:54:24 ± 0.15
Latitude 42.9148 ± 0.0072
Longitude 13.0462 ± 0.0098
Depth (km) 13 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96898641

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 786
Semi-minor axis of confidence ellipse (meter) 647
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 223
Circular confidence region, given by single value of horizontal uncertainty (meter) 790
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 163
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 16
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) 0.04766
Epicentral distance of station farthest from the epicenter (degree) 0.21134
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

ML:0.5

Field Value
Value 0.5
Uncertainty 0.1
Num. used stations 2
Type of magnitude ML
Reference to an origin 96898641
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-23 03:20:08
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.CSP1.EHZ. 2021-10-23T02:54:33.11 0.6 undecidable manual S 33 0.2113 99 0.01 49
IV.MMO1.EHZ. 2021-10-23T02:54:32.74 0.6 undecidable manual S 94 0.2059 99 -0.19 48
IV.FDMO.HHZ. 2021-10-23T02:54:30.26 0.6 undecidable manual S 14 0.125 116 -0.38 47
IV.CESI.HHZ. 2021-10-23T02:54:30.86 0.6 undecidable manual S 311 0.1376 112 -0.11 49
IV.MC2.EHZ. 2021-10-23T02:54:30.23 0.6 undecidable manual S 92 0.1043 124 0.12 49
IV.MMO1.EHZ. 2021-10-23T02:54:29.25 0.6 undecidable manual P 94 0.2059 99 -0.05 49
IT.MTCL.HGN. 2021-10-23T02:54:29.26 0.6 undecidable manual S 337 0.0863 132 -0.42 46
IV.CSP1.EHZ. 2021-10-23T02:54:29.33 0.6 positive manual P 33 0.2113 99 -0.07 49
IV.NRCA.HHZ. 2021-10-23T02:54:29.55 0.6 undecidable manual S 148 0.0953 128 -0.34 47
IV.FEMA.HNN. 2021-10-23T02:54:28.83 0.6 undecidable manual S 3 0.0477 151 -0.13 50
IV.CESI.HHZ. 2021-10-23T02:54:28.13 0.6 undecidable manual P 311 0.1376 112 -0.04 49
IV.NRCA.HHZ. 2021-10-23T02:54:27.51 0.1 undecidable manual P 148 0.0953 128 -0.03 100
IV.MC2.EHZ. 2021-10-23T02:54:27.76 1.0 undecidable manual P 92 0.1043 124 0.09 25
IV.FDMO.HHZ. 2021-10-23T02:54:27.91 1.0 undecidable manual P 14 0.125 116 -0.07 25
IT.MTCL.HGN. 2021-10-23T02:54:27.57 0.1 undecidable manual P 337 0.0863 132 0.15 99
IV.FEMA.HNN. 2021-10-23T02:54:27.59 0.1 undecidable manual P 3 0.0477 151 0.58 89
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FDMO.HHN. ML:0.6 3.575E-5 0.86 AML other m 2021-10-23T02:54:30.83
IV.FDMO.HHE. ML:0.4 2.64E-5 0.46 AML other m 2021-10-23T02:54:30.56
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