Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 16-04-2021 and time 08:37:02 (UTC) in region 2 km N Borbona (RI)

A magnitude ML 0.9 earthquake occured in region: 2 km N Borbona (RI), on

  • 16-04-2021 08:37:02 (UTC)
  • 16-04-2021 10:37:02 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.5290, 13.1300 at 10 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
Borbona RI 2 617 617
Posta RI 3 694 1311
Montereale AQ 10 2581 3892
Cittareale RI 10 482 4374
Micigliano RI 11 127 4501
Cagnano Amiterno AQ 11 1369 5870
Antrodoco RI 13 2588 8458
Capitignano AQ 14 665 9123
Leonessa RI 14 2435 11558
Borgo Velino RI 15 972 12530
Barete AQ 15 737 13267
Castel Sant'Angelo RI 17 1308 14575
Pizzoli AQ 17 4326 18901
Amatrice RI 17 2657 21558
Cantalice RI 20 2755 24313
Monteleone di Spoleto PG 20 599 24912

Municipalities with at least 50000 inhabitants

An earthquake occurred to
30 Km NW of L'Aquila (69753 inhabitants)
40 Km E of Terni (111501 inhabitants)
49 Km W of Teramo (54892 inhabitants)
59 Km SE of Foligno (57155 inhabitants)
68 Km NE of Guidonia Montecelio (88673 inhabitants)
69 Km NE of Tivoli (56533 inhabitants)
84 Km W of Montesilvano (53738 inhabitants)
85 Km E of Viterbo (67173 inhabitants)
87 Km W of Chieti (51815 inhabitants)
88 Km SE of Perugia (166134 inhabitants)
88 Km NE of Roma (2864731 inhabitants)
89 Km W of Pescara (121014 inhabitants)
98 Km NE of Velletri (53303 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 0.9 2021-04-16
08:37:02		 42.5292 13.1305 10 2021-07-12
16:55:07		 Bollettino Sismico Italiano INGV 89350861
Reviewed
Rev100 		ML 1.0 2021-04-16
08:37:01		 42.4917 13.1042 11 2021-04-16
09:04:56		 Sala Sismica INGV-Roma 89138761
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-16 08:37:02 ± 0.12
Latitude 42.5292 ± 0.0045
Longitude 13.1305 ± 0.0037
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 89350861

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 438
Semi-minor axis of confidence ellipse (meter) 247
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 205
Circular confidence region, given by single value of horizontal uncertainty (meter) 440.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 210
Number of associated phases, regardless of their use for origin computation 7
Number of defining phases 7
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.07
Epicentral distance of station closest to the epicenter (degree) 0.06475
Epicentral distance of station farthest from the epicenter (degree) 0.18166
Number of stations at which the event was observed 4
Number of stations from which data was used for origin computation 4
Magnitudes information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.2
Num. used stations 7
Type of magnitude ML
Reference to an origin 89350861
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-04-22 08:17:33

ML:1.0

Field Value
Value 1.0
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 89138761
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-16 09:04:56
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.T1299.HNE. 2021-04-16T08:37:09.65 1.0 undecidable manual S 47 16.9719 121 0.15 24
IV.SMA1.EHZ. 2021-04-16T08:37:07.07 0.1 undecidable manual P 56 20.1687 117 -0.07 97
IV.LNSS.HHZ. 2021-04-16T08:37:07.82 0.3 undecidable manual S 318 10.9779 133 -0.01 75
IV.T1299.HNE. 2021-04-16T08:37:06.60 0.1 positive manual P 47 16.9719 121 0.01 99
IV.RM33.EHZ. 2021-04-16T08:37:06.93 0.1 undecidable manual S 108 7.1928 145 -0.04 100
IV.LNSS.HHZ. 2021-04-16T08:37:05.63 0.1 undecidable manual P 318 10.9779 133 0 100
IV.RM33.EHZ. 2021-04-16T08:37:05.19 0.1 negative manual P 108 7.1928 145 0.06 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.RM33.EHN. ML:1.2 0.00022649999999999998 1.42 AML other m 2021-04-16T08:37:07.98
IV.RM33.EHE. ML:1.3 0.00028349999999999995 0.58 AML other m 2021-04-16T08:37:07.14
IV.LNSS.HHN. ML:0.7 0.00006110000000000001 1.22 AML other m 2021-04-16T08:37:08.22
IV.LNSS.HHE. ML:0.8 0.00008015 0.12 AML other m 2021-04-16T08:37:08.61
IV.SMA1.EHN. ML:0.8 0.000047 1.48 AML other m 2021-04-16T08:37:10.74
IV.SMA1.EHE. ML:0.8 0.0000486 1.5 AML other m 2021-04-16T08:37:10.89
IV.TERO.HHN. ML:0.9 0.00002415 1.04 AML other m 2021-04-16T08:37:15.23
IV.TERO.HHE. ML:0.8 0.000022100000000000002 0.46 AML other m 2021-04-16T08:37:15.45
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