Earthquake with magnitude of ML 1.1 on date 23-04-2021 and time 18:45:51 (Italy) in region 2 km NE Posta Fibreno (FR)

A magnitude ML 1.1 earthquake occured in region: 2 km NE Posta Fibreno (FR), on

  • 23-04-2021 16:45:51 (UTC)
  • 23-04-2021 18:45:51 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.704, 13.718 at 8 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
Posta Fibreno FR 2 1139 1139
Alvito FR 3 2713 3852
Vicalvi FR 3 783 4635
Fontechiari FR 5 1303 5938
Campoli Appennino FR 5 1725 7663
Broccostella FR 7 2741 10404
Pescosolido FR 7 1555 11959
Casalvieri FR 8 2698 14657
San Donato Val di Comino FR 8 2107 16764
Gallinaro FR 9 1269 18033
Sora FR 9 26144 44177
Casalattico FR 9 574 44751
Arpino FR 11 7262 52013
Atina FR 12 4316 56329
Settefrati FR 12 728 57057
Isola del Liri FR 12 11715 68772
Opi AQ 13 420 69192
Santopadre FR 13 1357 70549
Pescasseroli AQ 13 2203 72752
Picinisco FR 14 1218 73970
Villa Latina FR 14 1241 75211
Castelliri FR 14 3454 78665
Belmonte Castello FR 16 739 79404
Balsorano AQ 17 3569 82973
Rocca d'Arce FR 17 959 83932
Fontana Liri FR 17 2953 86885
Colle San Magno FR 17 699 87584
Roccasecca FR 17 7365 94949
Terelle FR 17 422 95371
Arce FR 18 5756 101127
Monte San Giovanni Campano FR 18 12929 114056
Colfelice FR 19 1932 115988
Castrocielo FR 19 3965 119953
Villetta Barrea AQ 19 653 120606
Civitella Alfedena AQ 20 296 120902
Villavallelonga AQ 20 919 121821

Municipalities with at least 50000 inhabitants

An earthquake occurred to
73 Km E of Latina (125985 inhabitants)
77 Km SE of L'Aquila (69753 inhabitants)
78 Km E of Velletri (53303 inhabitants)
81 Km SW of Chieti (51815 inhabitants)
81 Km E of Tivoli (56533 inhabitants)
87 Km NW of Caserta (76326 inhabitants)
88 Km E of Guidonia Montecelio (88673 inhabitants)
90 Km E of Aprilia (73446 inhabitants)
91 Km NW of Aversa (53047 inhabitants)
94 Km SW of Pescara (121014 inhabitants)
95 Km E of Anzio (54211 inhabitants)
95 Km NW of Giugliano in Campania (122974 inhabitants)
97 Km SW of Montesilvano (53738 inhabitants)
98 Km NW of Marano di Napoli (59874 inhabitants)
100 Km NW of Afragola (65057 inhabitants)
100 Km NW of Pozzuoli (81661 inhabitants)
100 Km NW of Acerra (59573 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 1.1 2021-04-23
16:45:51
41.7042 13.7177 8 2021-04-23
16:53:22
Sala Sismica INGV-Roma 89407871
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-23 16:45:51 ± 0.13
Latitude 41.7042 ± 0.0063
Longitude 13.7177 ± 0.0096
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 89407871

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 662
Semi-minor axis of confidence ellipse (meter) 619
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 147
Circular confidence region, given by single value of horizontal uncertainty (meter) 660
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 97
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) 0.27
Epicentral distance of station closest to the epicenter (degree) 0.01439
Epicentral distance of station farthest from the epicenter (degree) 0.33725
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 89407871
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-23 16:53:22
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.INTR.HHZ. 2021-04-23T16:46:05.00 0.3 undecidable manual S 24 0.3372 50 -0.04 71
IV.INTR.HHZ. 2021-04-23T16:45:59.21 0.1 undecidable manual P 24 0.3372 50 -0.25 91
IV.VVLD.HHZ. 2021-04-23T16:45:59.30 0.3 undecidable manual S 337 0.1799 111 0.04 74
IV.LRP.EHZ. 2021-04-23T16:45:57.10 0.6 undecidable manual S 240 0.1133 121 0.15 49
IT.OPI.HGZ. 2021-04-23T16:45:57.00 0.3 undecidable manual S 49 0.1106 122 0.13 73
IV.CERA.HNZ. 2021-04-23T16:45:57.33 0.6 undecidable manual P 115 0.2482 106 -0.25 46
IV.MCI.EHZ. 2021-04-23T16:45:57.05 0.3 undecidable manual P 161 0.2248 107 -0.01 73
IV.VVLD.HHZ. 2021-04-23T16:45:56.14 0.1 undecidable manual P 337 0.1799 111 0.01 98
IV.LRP.EHZ. 2021-04-23T16:45:55.01 0.3 undecidable manual P 240 0.1133 121 0.22 72
IT.OPI.HGZ. 2021-04-23T16:45:55.22 0.1 undecidable manual P 49 0.1106 122 0.47 91
IV.POFI.HHZ. 2021-04-23T16:45:53.32 0.1 positive manual P 342 0.0144 169 -0.09 100
IV.POFI.HHZ. 2021-04-23T16:45:53.80 0.6 undecidable manual S 342 0.0144 169 -0.76 41
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LRP.EHE. ML:1 0.0001121258 0.2816 AML other m 2021-04-23T16:45:58.54
IV.VVLD.HHE. ML:1 8.275E-5 0.32 AML other m 2021-04-23T16:45:59.48
IV.LRP.EHN. ML:0.4 2.7821805E-5 0.1792 AML other m 2021-04-23T16:46:00.23
IV.VVLD.HHN. ML:1 7.53E-5 0.78 AML other m 2021-04-23T16:46:02.65
IV.INTR.HHE. ML:0.9 3.2364095E-5 0.1536 AML other m 2021-04-23T16:46:05.68
IV.INTR.HHN. ML:1.1 4.3398735E-5 0.4992 AML other m 2021-04-23T16:46:11.51
IV.POFI.HHE. ML:0 0.0031910345 0.128 AML other m 2021-04-23T16:45:54.11
IV.POFI.HHN. ML:0 0.002201186 0.1024 AML other m 2021-04-23T16:45:54.16
IV.POFI.HNE. ML:0 0.003268916 0.1152 AML other m 2021-04-23T16:45:54.11
IV.POFI.HNN. ML:0 0.0023264075 0.1792 AML other m 2021-04-23T16:45:54.22
IV.VVLD.HNE. ML:1.1 0.000100248155 0.9344 AML other m 2021-04-23T16:45:59.21
IV.VVLD.HNN. ML:1.3 0.000152416 0.384 AML other m 2021-04-23T16:46:00.33
IV.INTR.HNE. ML:1.5 0.0001191353 0.5504 AML other m 2021-04-23T16:46:05.75
IV.INTR.HNN. ML:1.5 0.000129491 0.8576 AML other m 2021-04-23T16:46:14.14
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