Earthquake with magnitude of ML 0.8 on date 24-09-2021 and time 03:17:34 (Italy) in region 2 km SE Norcia (PG)

A magnitude ML 0.8 earthquake occured in region: 2 km SE Norcia (PG), on

  • 24-09-2021 01:17:34 (UTC)
  • 24-09-2021 03:17:34 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.779, 13.11 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
Norcia PG 2 4957 4957
Cascia PG 10 3217 8174
Preci PG 13 724 8898
Castelsantangelo sul Nera MC 14 281 9179
Accumoli RI 15 667 9846
Arquata del Tronto AP 15 1178 11024
Poggiodomo PG 16 117 11141
Cerreto di Spoleto PG 16 1075 12216
Visso MC 17 1107 13323
Cittareale RI 18 482 13805
Ussita MC 19 444 14249
Monteleone di Spoleto PG 19 599 14848
Sellano PG 19 1079 15927
Montegallo AP 20 523 16450

Municipalities with at least 50000 inhabitants

An earthquake occurred to
39 Km SE of Foligno (57155 inhabitants)
45 Km NE of Terni (111501 inhabitants)
50 Km W of Teramo (54892 inhabitants)
53 Km NW of L'Aquila (69753 inhabitants)
69 Km SE of Perugia (166134 inhabitants)
90 Km W of Montesilvano (53738 inhabitants)
91 Km E of Viterbo (67173 inhabitants)
92 Km NE of Guidonia Montecelio (88673 inhabitants)
94 Km N of Tivoli (56533 inhabitants)
97 Km W of Pescara (121014 inhabitants)
99 Km W of Chieti (51815 inhabitants)
99 Km SW of Ancona (100861 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 0.8 2021-09-24
01:17:34
42.7787 13.1097 10 2021-09-24
01:23:40
Sala Sismica INGV-Roma 95804341
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-24 01:17:34 ± 0.05
Latitude 42.7787 ± 0.0018
Longitude 13.1097 ± 0.0061
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 95804341

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 466
Semi-minor axis of confidence ellipse (meter) 158
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 89
Circular confidence region, given by single value of horizontal uncertainty (meter) 470
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 130
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.18
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.32106
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 10
Magnitude information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.3
Num. used stations 13
Type of magnitude ML
Reference to an origin 95804341
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-24 01:23:40
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.GIUL.HHZ. 2021-09-24T01:18:16.67 3.0 undecidable manual Sg 3.01 0
IV.RMP.HHZ. 2021-09-24T01:17:53.09 3.0 negative manual Pg -0.18 0
IV.CSP1.EHZ. 2021-09-24T01:17:46.66 0.1 undecidable manual S 13 0.3211 50 0.18 96
IV.RM33.EHZ. 2021-09-24T01:17:45.32 0.1 undecidable manual S 164 0.2806 50 0.04 99
IV.CESI.HHZ. 2021-09-24T01:17:44.89 0.1 undecidable manual S 326 0.2716 50 -0.13 98
IV.FDMO.HHZ. 2021-09-24T01:17:44.48 0.1 undecidable manual S 356 0.2581 50 -0.15 97
IV.SMA1.EHZ. 2021-09-24T01:17:43.21 0.1 undecidable manual S 132 0.2221 112 -0.34 94
IV.MMO1.EHZ. 2021-09-24T01:17:42.49 0.1 undecidable manual S 53 0.1996 114 -0.27 96
IV.T1299.HNZ. 2021-09-24T01:17:42.85 0.6 undecidable manual S 139 0.1925 115 0.36 47
IV.LNSS.HNN. 2021-09-24T01:17:42.03 0.1 undecidable manual S 196 0.1826 116 -0.14 99
IV.MC2.EHZ. 2021-09-24T01:17:41.18 0.1 undecidable manual S 24 0.1448 122 0.29 97
IV.CSP1.EHZ. 2021-09-24T01:17:41.29 0.3 undecidable manual P 13 0.3211 50 -0.04 74
IV.FDMO.HHZ. 2021-09-24T01:17:40.17 0.6 negative manual P 356 0.2581 50 -0.1 49
IV.CESI.HHZ. 2021-09-24T01:17:40.52 0.6 positive manual P 326 0.2716 50 0.03 50
IV.RM33.EHZ. 2021-09-24T01:17:40.68 1.0 undecidable manual P 164 0.2806 50 0.04 25
IV.SMA1.EHZ. 2021-09-24T01:17:39.70 1.0 positive manual P 132 0.2221 112 0.06 25
IV.MMO1.EHZ. 2021-09-24T01:17:39.23 1.0 negative manual P 53 0.1996 114 0.05 25
IV.T1299.HNZ. 2021-09-24T01:17:39.24 0.1 undecidable manual P 139 0.1925 115 0.21 97
IV.LNSS.HNN. 2021-09-24T01:17:38.97 0.1 undecidable manual P 196 0.1826 116 0.12 99
IV.MC2.EHZ. 2021-09-24T01:17:38.38 0.6 positive manual P 24 0.1448 122 0.27 49
IV.NRCA.HHZ. 2021-09-24T01:17:38.19 0.1 undecidable manual S 4 0.0549 149 -0.21 100
IV.NRCA.HHZ. 2021-09-24T01:17:36.83 0.3 undecidable manual P 4 0.0549 149 0.16 76
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1 0.000175 0.08 AML other m 2021-09-24T01:17:38.29
IV.NRCA.HHE. ML:1.1 0.000197 0.16 AML other m 2021-09-24T01:17:38.37
IV.FDMO.HHN. ML:0.7 2.325E-5 0.2 AML other m 2021-09-24T01:17:44.67
IV.FDMO.HHE. ML:0.8 3.205E-5 0.18 AML other m 2021-09-24T01:17:45.04
IV.NRCA.HNE. ML:1.1 0.0001836229 0.1096 AML other m 2021-09-24T01:17:38.37
IV.NRCA.HNN. ML:1 0.0001770914 0.1 AML other m 2021-09-24T01:17:38.28
IV.SMA1.EHE. ML:0.5 2.093795E-5 0.2 AML other m 2021-09-24T01:17:44.36
IV.SMA1.EHN. ML:0.4 1.6058185E-5 0.3 AML other m 2021-09-24T01:17:45.66
IV.CESI.HHE. ML:0.5 1.6593624E-5 0.18 AML other m 2021-09-24T01:17:45.12
IV.CESI.HHN. ML:0.8 2.8186585E-5 0.24 AML other m 2021-09-24T01:17:45.15
IV.CESI.HNE. ML:1.5 0.00014687445 0.84 AML other m 2021-09-24T01:17:43.63
IV.RM33.EHE. ML:0.3 9.4541615E-6 0.12 AML other m 2021-09-24T01:17:46.09
IV.RM33.EHN. ML:0.5 1.4936705E-5 0.08 AML other m 2021-09-24T01:17:45.50
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