Earthquake with magnitude of ML 0.5 on date 09-04-2021 and time 21:51:50 (Italy) in region 2 km S Norcia (PG)

A magnitude ML 0.5 earthquake occured in region: 2 km S Norcia (PG), on

  • 09-04-2021 19:51:50 (UTC)
  • 09-04-2021 21:51:50 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.78, 13.099 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 12 724 8898
Castelsantangelo sul Nera MC 14 281 9179
Poggiodomo PG 15 117 9296
Accumoli RI 15 667 9963
Cerreto di Spoleto PG 16 1075 11038
Arquata del Tronto AP 16 1178 12216
Visso MC 17 1107 13323
Sellano PG 19 1079 14402
Cittareale RI 19 482 14884
Monteleone di Spoleto PG 19 599 15483
Ussita MC 19 444 15927
Vallo di Nera PG 19 364 16291

Municipalities with at least 50000 inhabitants

An earthquake occurred to
38 Km SE of Foligno (57155 inhabitants)
44 Km NE of Terni (111501 inhabitants)
51 Km W of Teramo (54892 inhabitants)
54 Km NW of L'Aquila (69753 inhabitants)
68 Km SE of Perugia (166134 inhabitants)
91 Km E of Viterbo (67173 inhabitants)
91 Km W of Montesilvano (53738 inhabitants)
92 Km NE of Guidonia Montecelio (88673 inhabitants)
94 Km N of Tivoli (56533 inhabitants)
98 Km W of Pescara (121014 inhabitants)
99 Km SW of Ancona (100861 inhabitants)
100 Km W of Chieti (51815 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 2021-04-09
19:51:50
42.7795 13.0993 10 2021-04-09
19:59:29
Sala Sismica INGV-Roma 88950281
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-09 19:51:50 ± 0.06
Latitude 42.7795 ± 0.0027
Longitude 13.0993 ± 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 88950281

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 517
Semi-minor axis of confidence ellipse (meter) 231
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 79
Circular confidence region, given by single value of horizontal uncertainty (meter) 520
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 88
Number of associated phases, regardless of their use for origin computation 21
Number of defining phases 21
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
Epicentral distance of station farthest from the epicenter (degree) 0.402
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 12
Magnitude information

ML:0.5

Field Value
Value 0.5
Uncertainty 0.2
Num. used stations 10
Type of magnitude ML
Reference to an origin 88950281
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-09 19:59:29
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.RMP.HHZ. 2021-04-09T19:52:25.12 0.6 undecidable manual S -0.24 1
IV.TERO.HHZ. 2021-04-09T19:52:05.24 0.6 undecidable manual S 113 0.402 50 -0.27 46
IV.CESI.HHZ. 2021-04-09T19:52:01.48 0.6 undecidable manual S 328 0.2662 50 -0.01 50
IV.RM33.EHZ. 2021-04-09T19:52:01.83 0.6 undecidable manual S 163 0.2833 50 -0.16 48
IV.SMA1.EHN. 2021-04-09T19:52:00.76 0.6 undecidable manual S 131 0.2284 50 0.4 46
IV.FDMO.HHZ. 2021-04-09T19:52:00.84 0.6 undecidable manual S 358 0.2572 50 -0.36 46
IV.TERO.HHZ. 2021-04-09T19:51:59.28 1.0 undecidable manual P 113 0.402 50 -0.06 24
IV.MMO1.EHZ. 2021-04-09T19:51:59.30 0.6 undecidable manual S 54 0.205 114 -0.26 48
IV.LNSS.HHZ. 2021-04-09T19:51:58.32 0.6 undecidable manual S 194 0.1817 117 -0.42 46
IV.RM33.EHZ. 2021-04-09T19:51:57.17 0.6 positive manual P 163 0.2833 50 -0.13 48
IV.MC2.EHZ. 2021-04-09T19:51:57.74 0.6 undecidable manual S 26 0.1475 122 0.16 49
IV.CESI.HHZ. 2021-04-09T19:51:57.11 0.1 undecidable manual P 328 0.2662 50 0.09 98
IV.SMA1.EHN. 2021-04-09T19:51:56.57 0.6 undecidable manual P 131 0.2284 50 0.2 48
IV.FDMO.HHZ. 2021-04-09T19:51:56.86 0.6 positive manual P 358 0.2572 50 0 50
IV.LNSS.HHZ. 2021-04-09T19:51:55.49 1.0 undecidable manual P 194 0.1817 117 0.06 25
IV.T1299.EHZ. 2021-04-09T19:51:55.98 0.6 undecidable manual P 137 0.1979 115 0.22 48
IV.MMO1.EHZ. 2021-04-09T19:51:55.94 1.0 negative manual P 54 0.205 114 0.03 25
IV.MC2.EHZ. 2021-04-09T19:51:55.03 1.0 undecidable manual P 26 0.1475 122 0.27 24
IV.GAVE.EHN. 2021-04-09T19:51:55.63 1.0 undecidable manual P 240 0.1745 118 0.35 24
IV.NRCA.HHZ. 2021-04-09T19:51:54.68 0.6 undecidable manual S 11 0.0549 149 -0.33 48
IV.NRCA.HHZ. 2021-04-09T19:51:53.45 0.1 undecidable manual P 11 0.0549 149 0.17 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.6 0.000602 0.14 AML other m 2021-04-09T19:51:54.75
IV.NRCA.HHE. ML:1.3 0.00032812235 0.1152 AML other m 2021-04-09T19:51:54.82
IV.LNSS.HHN. ML:0.7 3.755E-5 0.14 AML other m 2021-04-09T19:51:59.34
IV.LNSS.HHE. ML:0.7 3.9075505E-5 0.1536 AML other m 2021-04-09T19:51:59.63
IV.NRCA.HNE. ML:1.4 0.00035692135 0.1408 AML other m 2021-04-09T19:51:54.82
IV.NRCA.HNN. ML:1.5 0.0005397424 0.1408 AML other m 2021-04-09T19:51:54.75
IV.FDMO.HHE. ML:0.3 8.5367405E-6 0.1536 AML other m 2021-04-09T19:52:02.28
IV.FDMO.HHN. ML:0.3 1.1956982E-5 0.2048 AML other m 2021-04-09T19:52:02.94
IV.CESI.HHE. ML:0.5 1.633095E-5 0.0768 AML other m 2021-04-09T19:52:01.90
IV.CESI.HHN. ML:0.5 1.46911745E-5 0.1024 AML other m 2021-04-09T19:52:01.99
IV.RM33.EHE. ML:0.5 1.4342499E-5 0.6016 AML other m 2021-04-09T19:52:13.43
IV.RM33.EHN. ML:0.3 1.05875675E-5 0.1664 AML other m 2021-04-09T19:52:02.19
IV.TERO.HHE. ML:0.2 6.990445E-6 0.1152 AML other m 2021-04-09T19:52:06.24
IV.TERO.HHN. ML:0.5 1.12885E-5 0.768 AML other m 2021-04-09T19:52:16.83
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