Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 08-04-2021 and time 22:10:04 (Italy) in region 2 km NW Castelliri (FR)

A magnitude ML 1.4 earthquake occured in region: 2 km NW Castelliri (FR), on

  • 08-04-2021 20:10:04 (UTC)
  • 08-04-2021 22:10:04 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.6900, 13.5290 at 9 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Castelliri FR 2 3454 3454
Isola del Liri FR 4 11715 15169
Monte San Giovanni Campano FR 6 12929 28098
Boville Ernica FR 7 8737 36835
Sora FR 8 26144 62979
Arpino FR 8 7262 70241
Broccostella FR 9 2741 72982
Fontana Liri FR 9 2953 75935
Veroli FR 9 20560 96495
Strangolagalli FR 10 2491 98986
Arce FR 12 5756 104742
Ripi FR 12 5270 110012
Rocca d'Arce FR 12 959 110971
Fontechiari FR 13 1303 112274
Pescosolido FR 13 1555 113829
Torrice FR 13 4816 118645
Santopadre FR 13 1357 120002
Balsorano AQ 13 3569 123571
Campoli Appennino FR 14 1725 125296
Posta Fibreno FR 14 1139 126435
Vicalvi FR 15 783 127218
Collepardo FR 16 968 128186
Frosinone FR 16 46323 174509
Ceprano FR 16 8897 183406
Alatri FR 16 28952 212358
San Vincenzo Valle Roveto AQ 16 2347 214705
Colfelice FR 16 1932 216637
Casalvieri FR 17 2698 219335
Arnara FR 17 2309 221644
Pofi FR 17 4204 225848
Alvito FR 18 2713 228561
Casalattico FR 18 574 229135
Vico nel Lazio FR 18 2234 231369
Roccasecca FR 19 7365 238734

Municipalities with at least 50000 inhabitants

An earthquake occurred to
58 Km E of Latina (125985 inhabitants)
62 Km E of Velletri (53303 inhabitants)
68 Km E of Tivoli (56533 inhabitants)
74 Km E of Aprilia (73446 inhabitants)
74 Km S of L'Aquila (69753 inhabitants)
75 Km E of Guidonia Montecelio (88673 inhabitants)
80 Km E of Anzio (54211 inhabitants)
85 Km E of Pomezia (62966 inhabitants)
90 Km E of Roma (2864731 inhabitants)
91 Km SW of Chieti (51815 inhabitants)
96 Km NW of Caserta (76326 inhabitants)
98 Km NW of Aversa (53047 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000 		ML 1.4 2021-04-08
20:10:04		 41.6903 13.5293 9 2021-07-12
16:55:13		 Bollettino Sismico Italiano INGV 90703771
Reviewed
Rev100 		ML 1.5 2021-04-08
20:10:04		 41.6882 13.5305 10 2021-04-08
20:19:01		 Sala Sismica INGV-Roma 88922721
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-08 20:10:04 ± 0.05
Latitude 41.6903 ± 0.0027
Longitude 13.5293 ± 0.0036
Depth (km) 9 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 90703771

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 290
Semi-minor axis of confidence ellipse (meter) 251
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 59
Circular confidence region, given by single value of horizontal uncertainty (meter) 290.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 66
Number of associated phases, regardless of their use for origin computation 19
Number of defining phases 19
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.18
Epicentral distance of station closest to the epicenter (degree) 0.06115
Epicentral distance of station farthest from the epicenter (degree) 0.48294
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 10
Magnitudes information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.2
Num. used stations 16
Type of magnitude ML
Reference to an origin 90703771
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-06-01 19:57:55

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 17
Type of magnitude ML
Reference to an origin 88922721
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-08 20:19:01
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CERT.HHZ. 2021-04-08T20:10:21.72 0.3 undecidable manual S 303 53.6019 50 0.23 68
IV.CERA.HHZ. 2021-04-08T20:10:18.47 0.3 undecidable manual S 104 41.8248 50 0.12 71
IV.PTQR.HHE. 2021-04-08T20:10:17.25 0.3 undecidable manual S 344 38.2284 50 -0.16 71
IV.CERT.HHZ. 2021-04-08T20:10:14.11 0.3 undecidable manual P 303 53.6019 50 -0.12 70
IV.GIUL.HHZ. 2021-04-08T20:10:14.41 0.3 undecidable manual S 237 27.0507 109 0.18 72
IV.VVLD.HHZ. 2021-04-08T20:10:12.41 0.3 undecidable manual S 21 21.3675 113 0.04 75
IV.GUAR.HHZ. 2021-04-08T20:10:12.26 0.3 undecidable manual S 303 21.3675 113 -0.11 74
IV.CERA.HHZ. 2021-04-08T20:10:12.28 0.3 undecidable manual P 104 41.8248 50 -0.13 71
IV.LIK.EHN.01 2021-04-08T20:10:12.46 0.6 undecidable manual S 173 21.3675 113 0.11 50
IV.PTQR.HHE. 2021-04-08T20:10:11.81 0.1 undecidable manual P 344 38.2284 50 -0.06 97
IV.GIUL.HHZ. 2021-04-08T20:10:10.05 0.1 undecidable manual P 237 27.0507 109 0.01 100
IV.MCI.EHN. 2021-04-08T20:10:10.69 0.6 undecidable manual P 133 32.3454 50 -0.26 47
IV.POFI.HHZ. 2021-04-08T20:10:10.98 0.6 undecidable manual S 79 15.4734 121 0.45 47
IV.LIK.EHN.01 2021-04-08T20:10:09.33 0.6 undecidable manual P 173 21.3675 113 0.38 47
IV.VVLD.HHZ. 2021-04-08T20:10:09.05 0.1 undecidable manual P 21 21.3675 113 0.09 99
IV.GUAR.HHZ. 2021-04-08T20:10:09.01 0.3 undecidable manual P 303 21.3675 113 0.05 75
IV.POFI.HHZ. 2021-04-08T20:10:08.01 0.1 undecidable manual P 79 15.4734 121 0.11 100
IV.LRP.EHZ. 2021-04-08T20:10:07.93 0.6 undecidable manual S 135 6.7932 144 -0.32 48
IV.LRP.EHZ. 2021-04-08T20:10:06.20 0.1 undecidable manual P 135 6.7932 144 -0.38 96
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LRP.EHE. ML:1.8 0.0010628524500000001 1.808 AML other m 2021-04-08T20:10:07.92
IV.LRP.EHN. ML:1.4 0.000388415 0.2048 AML other m 2021-04-08T20:10:08.36
IV.VVLD.HHN. ML:1.6 0.0003145 0.32 AML other m 2021-04-08T20:10:12.73
IV.VVLD.HNN. ML:1.7 0.00036957275 0.3456 AML other m 2021-04-08T20:10:12.58
IV.VVLD.HHE. ML:1.4 0.00016606845 0.4608 AML other m 2021-04-08T20:10:13.31
IV.VVLD.HNE. ML:1.4 0.000186936035 0.4864 AML other m 2021-04-08T20:10:13.32
IV.GUAR.HHE. ML:1.3 0.00013692104499999998 0.1536 AML other m 2021-04-08T20:10:14.37
IV.GIUL.HHE. ML:1.2 0.00009636100000000001 0.2048 AML other m 2021-04-08T20:10:14.79
IV.GIUL.HHN. ML:1.3 0.00010546949 0.448 AML other m 2021-04-08T20:10:14.59
IV.GUAR.HHN. ML:1.2 0.0001132711 0.2304 AML other m 2021-04-08T20:10:14.26
IV.CERA.HNN. ML:1.5 0.00011290900000000001 1.5136 AML other m 2021-04-08T20:10:20.90
IV.CERA.HHN. ML:1.5 0.00011269999999999999 1.52 AML other m 2021-04-08T20:10:20.90
IV.CERA.HHE. ML:1.2 0.00005415561000000001 0.384 AML other m 2021-04-08T20:10:20.94
IV.CERT.HHE. ML:1.0 0.0000253 1.36 AML other m 2021-04-08T20:10:24.68
IV.CERT.HHN. ML:1.0 0.00002528704 0.3072 AML other m 2021-04-08T20:10:25.94
IV.CERA.HNE. ML:1.2 0.0000547475 0.384 AML other m 2021-04-08T20:10:20.93
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