Earthquake with magnitude of ML 1.2 on date 27-07-2021 and time 09:54:35 (Italy) in region 3 km SE Norcia (PG)

A magnitude ML 1.2 earthquake occured in region: 3 km SE Norcia (PG), on

  • 27-07-2021 07:54:35 (UTC)
  • 27-07-2021 09:54:35 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.778, 13.122 at 11 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 3 4957 4957
Cascia PG 11 3217 8174
Preci PG 13 724 8898
Castelsantangelo sul Nera MC 13 281 9179
Accumoli RI 14 667 9846
Arquata del Tronto AP 14 1178 11024
Poggiodomo PG 17 117 11141
Visso MC 17 1107 12248
Cerreto di Spoleto PG 17 1075 13323
Cittareale RI 18 482 13805
Ussita MC 19 444 14249
Montegallo AP 19 523 14772
Monteleone di Spoleto PG 20 599 15371

Municipalities with at least 50000 inhabitants

An earthquake occurred to
39 Km SE of Foligno (57155 inhabitants)
46 Km NE of Terni (111501 inhabitants)
49 Km W of Teramo (54892 inhabitants)
53 Km NW of L'Aquila (69753 inhabitants)
70 Km SE of Perugia (166134 inhabitants)
89 Km W of Montesilvano (53738 inhabitants)
92 Km NE of Guidonia Montecelio (88673 inhabitants)
92 Km E of Viterbo (67173 inhabitants)
94 Km N of Tivoli (56533 inhabitants)
96 Km W of Pescara (121014 inhabitants)
98 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 1.2 2021-07-27
07:54:35
42.7778 13.1223 11 2021-07-27
07:58:45
Sala Sismica INGV-Roma 93262551
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-07-27 07:54:35 ± 0.07
Latitude 42.7778 ± 0.0045
Longitude 13.1223 ± 0.0098
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 93262551

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 820
Semi-minor axis of confidence ellipse (meter) 410
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 100
Circular confidence region, given by single value of horizontal uncertainty (meter) 820
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 86
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.17
Epicentral distance of station closest to the epicenter (degree) 0.05576
Epicentral distance of station farthest from the epicenter (degree) 0.40559
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:1.2

Field Value
Value 1.2
Uncertainty 0.3
Num. used stations 4
Type of magnitude ML
Reference to an origin 93262551
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-07-27 07:58:45
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.FDMO.HHZ. 2021-07-27T07:54:45.52 0.3 undecidable manual S 354 0.2599 50 -0.22 70
IV.MOMA.HNE. 2021-07-27T07:54:44.35 0.6 undecidable manual P 274 0.4056 50 0.41 44
IV.LNSS.HHZ. 2021-07-27T07:54:43.40 0.3 undecidable manual S 199 0.1853 50 -0.12 73
IV.TERO.HHZ. 2021-07-27T07:54:43.45 0.6 undecidable manual P 113 0.3858 50 -0.15 46
IV.CSP1.EHZ. 2021-07-27T07:54:42.38 0.6 negative manual P 11 0.3193 50 -0.08 48
IV.MC2.EHZ. 2021-07-27T07:54:42.28 0.3 undecidable manual S 20 0.1421 125 0.05 74
IV.FDMO.HHZ. 2021-07-27T07:54:41.66 0.6 undecidable manual P 354 0.2599 50 0.22 47
IV.LNSS.HHZ. 2021-07-27T07:54:40.06 0.6 undecidable manual P 199 0.1853 50 -0.1 49
IV.MTRA.EHZ. 2021-07-27T07:54:40.70 0.6 undecidable manual P 96 0.2023 50 0.25 47
IV.MC2.EHZ. 2021-07-27T07:54:39.49 0.6 undecidable manual P 20 0.1421 125 0.08 49
IV.NRCA.HHZ. 2021-07-27T07:54:39.77 0.1 undecidable manual S 354 0.0558 150 -0.16 98
IV.NRCA.HHZ. 2021-07-27T07:54:38.16 0.1 negative manual P 354 0.0558 150 0.08 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.4 0.0003285 0.08 AML other m 2021-07-27T07:54:39.88
IV.NRCA.HHE. ML:1.4 0.0004095 0.12 AML other m 2021-07-27T07:54:39.99
IV.LNSS.HHE. ML:1 6.925E-5 0.1 AML other m 2021-07-27T07:54:44.01
IV.LNSS.HHN. ML:0.9 5.86E-5 0.26 AML other m 2021-07-27T07:54:44.52
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