Earthquake with magnitude of ML 0.9 on date 31-12-2019 and time 18:57:20 (Italy) in region 5 km SW Norcia (PG)

A magnitude ML 0.9 earthquake occured in region: 5 km SW Norcia (PG), on

  • 31-12-2019 17:57:20 (UTC)
  • 31-12-2019 18:57:20 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.76, 13.06 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 5 4957 4957
Cascia PG 6 3217 8174
Poggiodomo PG 11 117 8291
Cerreto di Spoleto PG 13 1075 9366
Preci PG 13 724 10090
Monteleone di Spoleto PG 15 599 10689
Vallo di Nera PG 16 364 11053
Castelsantangelo sul Nera MC 17 281 11334
Sellano PG 18 1079 12413
Accumoli RI 18 667 13080
Sant'Anatolia di Narco PG 18 564 13644
Cittareale RI 18 482 14126
Visso MC 19 1107 15233
Scheggino PG 19 461 15694
Arquata del Tronto AP 20 1178 16872

Municipalities with at least 50000 inhabitants

An earthquake occurred to
36 Km SE of Foligno (57155 inhabitants)
40 Km NE of Terni (111501 inhabitants)
54 Km NW of L'Aquila (69753 inhabitants)
54 Km W of Teramo (54892 inhabitants)
66 Km SE of Perugia (166134 inhabitants)
87 Km E of Viterbo (67173 inhabitants)
89 Km NE of Guidonia Montecelio (88673 inhabitants)
91 Km N of Tivoli (56533 inhabitants)
94 Km W of Montesilvano (53738 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled 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
Rev 100 ML 0.9 2019-12-31
17:57:20
42.76 13.06 11 2019-12-31
18:07:15
Sala Sismica INGV-Roma 75143861
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2019-12-31 17:57:20 ± 0.05
Latitude 42.76 ± 0.00
Longitude 13.06 ± 0.01
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 75143861

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 529
Semi-minor axis of confidence ellipse (meter) 160
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 298
Circular confidence region, given by single value of horizontal uncertainty (meter) 530
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 58
Number of associated phases, regardless of their use for origin computation 17
Number of defining phases 17
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.16
Epicentral distance of station closest to the epicenter (degree) 0.08184
Epicentral distance of station farthest from the epicenter (degree) 0.35793
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 11
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.2
Num. used stations 9
Type of magnitude ML
Reference to an origin 75143861
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2019-12-31 18:07:15
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.FDMO.HHZ. 2019-12-31T17:57:30.79 0.3 undecidable manual S 5 0.2734 50 -0.21 71
IV.MMO1.EHZ. 2019-12-31T17:57:29.90 0.3 undecidable manual S 56 0.241 50 -0.13 72
IV.MOMA.HNE. 2019-12-31T17:57:28.03 0.6 undecidable manual P 277 0.3579 50 0.1 47
IV.MC2.EHZ. 2019-12-31T17:57:28.16 0.3 undecidable manual S 33 0.1772 118 0.13 73
IV.LNSS.HHZ. 2019-12-31T17:57:27.26 0.3 undecidable manual S 184 0.161 120 -0.23 72
IV.FDMO.HHZ. 2019-12-31T17:57:26.39 1.0 undecidable manual P 5 0.2734 50 -0.09 24
IV.MTRA.EHN. 2019-12-31T17:57:26.62 0.6 undecidable manual P 91 0.25 50 0.54 44
IV.SMA1.EHE. 2019-12-31T17:57:26.31 0.6 undecidable manual P 123 0.2446 50 0.32 46
IV.CESI.HNE. 2019-12-31T17:57:26.34 0.6 undecidable manual P 335 0.2653 50 0 49
IV.RM33.EHE. 2019-12-31T17:57:26.38 0.6 undecidable manual P 155 0.2797 50 -0.21 47
IV.GAVE.EHZ. 2019-12-31T17:57:26.86 0.3 undecidable manual S 239 0.1385 124 0.11 74
IV.MMO1.EHZ. 2019-12-31T17:57:25.76 1.0 undecidable manual P 56 0.241 50 -0.15 24
IV.GAVE.EHZ. 2019-12-31T17:57:24.11 0.6 positive manual P 239 0.1385 124 0.09 50
IV.MC2.EHZ. 2019-12-31T17:57:24.81 0.3 undecidable manual P 33 0.1772 118 0.05 74
IV.LNSS.HHZ. 2019-12-31T17:57:24.38 0.1 undecidable manual P 184 0.161 120 -0.07 99
IV.NRCA.HHZ. 2019-12-31T17:57:24.98 0.1 undecidable manual S 32 0.0818 139 -0.14 99
IV.NRCA.HHZ. 2019-12-31T17:57:23.18 0.1 positive manual P 32 0.0818 139 0.1 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.GAVE.EHN. ML:1.1 0.0001225 1.78 AML other m 2019-12-31T17:57:27.09
IV.NRCA.HHN. ML:0.9 9.28E-5 0.98 AML other m 2019-12-31T17:57:25.15
IV.GAVE.EHE. ML:1.1 0.0001114 0.16 AML other m 2019-12-31T17:57:27.51
IV.LNSS.HHN. ML:0.9 6.245E-5 0.76 AML other m 2019-12-31T17:57:27.44
IV.LNSS.HHE. ML:0.9 6.575E-5 0.16 AML other m 2019-12-31T17:57:27.68
IV.NRCA.HNE. ML:1.1 0.000153819625 0.1792 AML other m 2019-12-31T17:57:25.13
IV.FDMO.HHE. ML:0.5 1.534753E-5 0.1152 AML other m 2019-12-31T17:57:31.78
IV.FDMO.HHN. ML:0.6 1.853662E-5 0.192 AML other m 2019-12-31T17:57:31.38
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download