Earthquake with magnitude of ML 0.9 on date 18-10-2021 and time 14:11:31 (UTC) in region 4 km E Preci (PG)

A magnitude ML 0.9 earthquake occured in region: 4 km E Preci (PG), on

  • 18-10-2021 14:11:31 (UTC)
  • 18-10-2021 16:11:31 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.874, 13.085 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
Preci PG 4 724 724
Castelsantangelo sul Nera MC 6 281 1005
Visso MC 6 1107 2112
Ussita MC 9 444 2556
Norcia PG 9 4957 7513
Sellano PG 13 1079 8592
Monte Cavallo MC 15 145 8737
Cerreto di Spoleto PG 15 1075 9812
Bolognola MC 18 142 9954
Fiordimonte MC 18 202 10156
Cascia PG 18 3217 13373
Acquacanina MC 19 121 13494
Fiastra MC 19 559 14053
Pieve Torina MC 19 1458 15511

Municipalities with at least 50000 inhabitants

An earthquake occurred to
32 Km E of Foligno (57155 inhabitants)
50 Km NE of Terni (111501 inhabitants)
56 Km W of Teramo (54892 inhabitants)
62 Km E of Perugia (166134 inhabitants)
64 Km NW of L'Aquila (69753 inhabitants)
90 Km SW of Ancona (100861 inhabitants)
95 Km NE of Viterbo (67173 inhabitants)
96 Km W of Montesilvano (53738 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 0.9 2021-10-18
14:11:31
42.8745 13.0852 11 2021-10-18
14:22:01
Sala Sismica INGV-Roma 96728901
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-18 14:11:31 ± 0.06
Latitude 42.8745 ± 0.0036
Longitude 13.0852 ± 0.0037
Depth (km) 11 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96728901

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 440
Semi-minor axis of confidence ellipse (meter) 120
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 37
Circular confidence region, given by single value of horizontal uncertainty (meter) 440
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 23
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.12
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.25721
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 10
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.3
Num. used stations 16
Type of magnitude ML
Reference to an origin 96728901
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-18 14:22:01
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MTRA.EHZ. 2021-10-18T14:11:41.05 0.3 undecidable manual S 117 0.2572 90 -0.07 71
IV.MML1.EHZ. 2021-10-18T14:11:41.00 0.6 undecidable manual S 341 0.2527 90 -0.01 48
IV.CSP1.EHZ. 2021-10-18T14:11:40.51 0.6 undecidable manual S 22 0.2338 90 0.06 48
IV.CESI.HHZ. 2021-10-18T14:11:39.04 0.6 undecidable manual S 315 0.1853 90 0.03 48
IV.SNTG.HHZ. 2021-10-18T14:11:39.58 3.0 undecidable manual P 0.09 0
IV.MMO1.EHZ. 2021-10-18T14:11:38.62 0.6 undecidable manual S 82 0.179 90 -0.19 47
IV.ASSB.HHZ. 2021-10-18T14:11:38.53 3.0 negative manual P -0.2 0
IV.FDMO.HHZ. 2021-10-18T14:11:38.12 0.3 undecidable manual S 1 0.1619 90 -0.19 71
IT.MTCL.HGZ. 2021-10-18T14:11:37.26 0.3 undecidable manual S 332 0.1349 90 -0.25 71
IV.MML1.EHZ. 2021-10-18T14:11:36.81 0.6 positive manual P 341 0.2527 90 0.01 48
IV.MTRA.EHZ. 2021-10-18T14:11:36.80 0.1 undecidable manual P 117 0.2572 90 -0.07 95
IV.FEMA.HNZ. 2021-10-18T14:11:36.21 0.6 undecidable manual S 344 0.0917 119 -0.06 50
IV.MC2.EHZ. 2021-10-18T14:11:36.16 0.6 undecidable manual S 64 0.0845 123 0.06 50
IV.GAVE.EHZ. 2021-10-18T14:11:36.99 3.0 negative manual P 0.62 0
IV.CSP1.EHZ. 2021-10-18T14:11:36.60 0.6 undecidable manual P 22 0.2338 90 0.12 48
IV.FDMO.HHZ. 2021-10-18T14:11:35.28 0.3 undecidable manual P 1 0.1619 90 0.03 73
IV.MMO1.EHZ. 2021-10-18T14:11:35.56 0.6 negative manual P 82 0.179 90 0.03 49
IV.CESI.HHZ. 2021-10-18T14:11:35.75 0.1 positive manual P 315 0.1853 90 0.1 96
IV.NRCA.HHZ. 2021-10-18T14:11:34.96 0.6 undecidable manual S 152 0.0459 147 -0.34 47
IT.MTCL.HGZ. 2021-10-18T14:11:34.74 0.1 undecidable manual P 332 0.1349 90 -0.05 99
IV.FEMA.HNZ. 2021-10-18T14:11:34.24 0.1 undecidable manual P 344 0.0917 119 0.17 96
IV.MC2.EHZ. 2021-10-18T14:11:34.19 0.1 negative manual P 64 0.0845 123 0.22 96
IV.NRCA.HHZ. 2021-10-18T14:11:33.54 0.1 undecidable manual P 152 0.0459 147 0.03 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HNN. ML:1.7 0.0007005 0.12 AML other m 2021-10-18T14:11:35.08
IV.NRCA.HHN. ML:1.7 0.0007845 0.1 AML other m 2021-10-18T14:11:35.07
IV.NRCA.HHE. ML:1.6 0.000568 0.16 AML other m 2021-10-18T14:11:35.03
IV.NRCA.HNE. ML:1.5 0.0005385 0.18 AML other m 2021-10-18T14:11:35.03
IV.FDMO.HHE. ML:0.8 5.015E-5 1.9 AML other m 2021-10-18T14:11:38.03
IV.FDMO.HHN. ML:0.6 3.535E-5 0.6 AML other m 2021-10-18T14:11:39.34
IV.CESI.HHN. ML:0.9 5.62E-5 1 AML other m 2021-10-18T14:11:39.60
IV.CESI.HHE. ML:0.8 4.07E-5 0.7 AML other m 2021-10-18T14:11:39.61
IV.MTRA.EHE. ML:1 5.74E-5 0.6 AML other m 2021-10-18T14:11:41.92
IV.MTRA.EHN. ML:1 5.035E-5 0.18 AML other m 2021-10-18T14:11:42.14
IV.CSP1.EHE. ML:0.9 4.2307455E-5 0.1024 AML other m 2021-10-18T14:11:40.72
IV.CSP1.EHN. ML:1 5.60074E-5 0.1792 AML other m 2021-10-18T14:11:42.20
IV.MML1.EHE. ML:0.6 2.072151E-5 0.16 AML other m 2021-10-18T14:11:41.24
IV.MML1.EHN. ML:0.8 2.872979E-5 0.096 AML other m 2021-10-18T14:11:41.42
IV.GAVE.EHE. ML:0.7 2.916517E-5 0.1216 AML other m 2021-10-18T14:11:40.91
IV.GAVE.EHN. ML:0.6 2.2438455E-5 0.0832 AML other m 2021-10-18T14:11:46.94
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