Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.2 on date 17-03-1991 and time 21:39:19 (Italy) in region 4 km E Palombara Sabina (RM)

A magnitude Md 2.2 earthquake occured in region: 4 km E Palombara Sabina (RM), on

  • 17-03-1991 20:39:19 (UTC)
  • 17-03-1991 21:39:19 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.0730, 12.8170 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
Palombara Sabina RM 4 13269 13269
Monteflavio RM 5 1348 14617
Marcellina RM 6 7280 21897
Moricone RM 6 2650 24547
San Polo dei Cavalieri RM 7 2992 27539
Licenza RM 7 1011 28550
Roccagiovine RM 7 263 28813
Montorio Romano RM 7 1984 30797
Percile RM 8 255 31052
Vicovaro RM 9 4019 35071
Sant'Angelo Romano RM 10 5018 40089
Montelibretti RM 10 5323 45412
Mandela RM 10 917 46329
Nerola RM 10 1926 48255
Scandriglia RI 11 3108 51363
Guidonia Montecelio RM 11 88673 140036
Castel Madama RM 12 7399 147435
Orvinio RI 12 405 147840
Tivoli RM 12 56533 204373
Cineto Romano RM 12 601 204974
Saracinesco RM 14 185 205159
Sambuci RM 14 925 206084
Vallinfreda RM 15 283 206367
Riofreddo RM 15 781 207148
Poggio Moiano RI 15 2751 209899
Mentana RM 15 22921 232820
Roviano RM 16 1351 234171
Pozzaglia Sabina RI 16 360 234531
Anticoli Corrado RM 16 915 235446
Vivaro Romano RM 16 182 235628
Ciciliano RM 16 1336 236964
Poggio Nativo RI 16 2622 239586
Toffia RI 17 1058 240644
Monterotondo RM 17 40830 281474
Fara in Sabina RI 17 13742 295216
Arsoli RM 17 1586 296802
Turania RI 18 241 297043
Frasso Sabino RI 18 743 297786
San Gregorio da Sassola RM 18 1619 299405
Monteleone Sabino RI 18 1224 300629
Fonte Nuova RM 18 32562 333191
Oricola AQ 19 1244 334435
Marano Equo RM 19 779 335214
Castelnuovo di Farfa RI 19 1059 336273
Colle di Tora RI 19 372 336645
Casape RM 19 744 337389
Cerreto Laziale RM 20 1118 338507
Paganico Sabino RI 20 172 338679
Casaprota RI 20 744 339423

Municipalities with at least 50000 inhabitants

An earthquake occurred to
11 Km NE of Guidonia Montecelio (88673 inhabitants)
12 Km N of Tivoli (56533 inhabitants)
34 Km NE of Roma (2864731 inhabitants)
43 Km N of Velletri (53303 inhabitants)
52 Km NE of Pomezia (62966 inhabitants)
55 Km N of Aprilia (73446 inhabitants)
56 Km S of Terni (111501 inhabitants)
57 Km SW of L'Aquila (69753 inhabitants)
58 Km NE of Fiumicino (78395 inhabitants)
68 Km N of Latina (125985 inhabitants)
70 Km SE of Viterbo (67173 inhabitants)
71 Km N of Anzio (54211 inhabitants)
84 Km E of Civitavecchia (52991 inhabitants)
98 Km SW of Teramo (54892 inhabitants)
99 Km S of Foligno (57155 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 		Md 2.2 1991-03-17
20:39:19		 42.073 12.817 10 2013-07-15
08:41:04		 Bollettino Sismico Italiano INGV 137679
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1991-03-17 20:39:19 ± 0.189
Latitude 42.0730 ± 0.0098
Longitude 12.8170 ± 0.0312
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 137679

Uncertainty

Field Value
Preferred uncertainty description horizontal uncertainty
Semi-major axis of confidence ellipse (meter)
Semi-minor axis of confidence ellipse (meter)
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi)
Circular confidence region, given by single value of horizontal uncertainty (meter) 2795.6
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 143
Number of associated phases, regardless of their use for origin computation 8
Number of defining phases 8
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.4
Epicentral distance of station closest to the epicenter (degree) 0.00210
Epicentral distance of station farthest from the epicenter (degree) 0.00737
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 5
Magnitude information

Md:2.2

Field Value
Value 2.2
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 137679
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 19:08:26
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
--.SDI.Z. 1991-03-17T20:39:37.40 10.0 undecidable manual PG 115 0.8214 0.83 0.2
--.MNS.Z. 1991-03-17T20:39:32.40 10.0 undecidable manual SG 342 0.3219 0.13 0.7
--.RMP.Z. 1991-03-17T20:39:31.00 10.0 undecidable manual SG 198 0.2664 0.39 0.5
--.CP9.Z. 1991-03-17T20:39:28.62 10.0 undecidable manual SG 154 0.2331 -0.66 0.2
--.RDP.Z. 1991-03-17T20:39:27.39 10.0 undecidable manual PG 193 0.3108 0.45 1.1
--.MNS.Z. 1991-03-17T20:39:26.72 10.0 undecidable manual PG 342 0.3219 -0.3 1.4
--.RMP.Z. 1991-03-17T20:39:26.00 10.0 undecidable manual PG 198 0.2664 -0.05 1.7
--.CP9.Z. 1991-03-17T20:39:24.88 10.0 positive manual PG 154 0.2331 -0.41 2.2
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