Earthquake with magnitude of Md 2.9 on date 26-04-1989 and time 10:23:18 (Italy) in region 2 km NW Poggio San Lorenzo (RI)

A magnitude Md 2.9 earthquake occured in region: 2 km NW Poggio San Lorenzo (RI), on

  • 26-04-1989 08:23:18 (UTC)
  • 26-04-1989 10:23:18 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.2700, 12.8380 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Poggio San Lorenzo RI 2 589 589
Montenero Sabino RI 2 299 888
Torricella in Sabina RI 3 1342 2230
Casaprota RI 3 744 2974
Monteleone Sabino RI 4 1224 4198
Frasso Sabino RI 5 743 4941
Poggio Nativo RI 7 2622 7563
Belmonte in Sabina RI 7 636 8199
Rocca Sinibalda RI 7 815 9014
Mompeo RI 8 530 9544
Salisano RI 8 567 10111
Poggio Moiano RI 8 2751 12862
Monte San Giovanni in Sabina RI 8 714 13576
Castelnuovo di Farfa RI 9 1059 14635
Toffia RI 9 1058 15693
Longone Sabino RI 11 597 16290
Colle di Tora RI 11 372 16662
Fara in Sabina RI 11 13742 30404
Scandriglia RI 12 3108 33512
Castel di Tora RI 12 288 33800
Montopoli di Sabina RI 12 4210 38010
Poggio Catino RI 12 1341 39351
Nerola RM 13 1926 41277
Poggio Mirteto RI 13 6315 47592
Roccantica RI 13 563 48155
Concerviano RI 14 291 48446
Montorio Romano RM 15 1984 50430
Rieti RI 15 47698 98128
Varco Sabino RI 15 187 98315
Ascrea RI 16 234 98549
Casperia RI 16 1246 99795
Paganico Sabino RI 16 172 99967
Cittaducale RI 16 6828 106795
Pozzaglia Sabina RI 16 360 107155
Cantalupo in Sabina RI 16 1685 108840
Contigliano RI 17 3783 112623
Montelibretti RM 17 5323 117946
Orvinio RI 17 405 118351
Monteflavio RM 18 1348 119699
Moricone RM 18 2650 122349
Marcetelli RI 18 89 122438
Montasola RI 18 395 122833
Torrita Tiberina RM 18 1089 123922
Selci RI 19 1106 125028
Torri in Sabina RI 19 1256 126284
Petrella Salto RI 19 1197 127481
Collegiove RI 20 213 127694
Cottanello RI 20 563 128257
Filacciano RM 20 477 128734

Municipalities with at least 50000 inhabitants

An earthquake occurred to
31 Km N of Guidonia Montecelio (88673 inhabitants)
34 Km N of Tivoli (56533 inhabitants)
36 Km SE of Terni (111501 inhabitants)
47 Km W of L'Aquila (69753 inhabitants)
51 Km NE of Roma (2864731 inhabitants)
62 Km E of Viterbo (67173 inhabitants)
65 Km N of Velletri (53303 inhabitants)
72 Km NE of Pomezia (62966 inhabitants)
74 Km NE of Fiumicino (78395 inhabitants)
77 Km N of Aprilia (73446 inhabitants)
77 Km S of Foligno (57155 inhabitants)
83 Km SW of Teramo (54892 inhabitants)
88 Km E of Civitavecchia (52991 inhabitants)
89 Km N of Latina (125985 inhabitants)
93 Km N of Anzio (54211 inhabitants)
100 Km SE of Perugia (166134 inhabitants)
Recent and historical seismicity

These maps show the seismic activity in different time intervals, before the seismic event to which they refer. Data reported in the first two maps come from the analysis carried out in real time by the personnel of the INGV Operating Rooms, immediately after each earthquake. The third map shows data from 1985 to the date of the earthquake: the locations are reviewed by the seismological analysts of the INGV Italian Seismic Bulletin (Bollettino Sismico Italiano dell’INGV). The localization parameters (hypocentral coordinates and magnitude) are the best possible estimate with the data available to the INGV, but are constantly updated according to further data that become available. The location and magnitude parameters, subsequently reviewed by seismological analysts, may vary.

Earthquakes of the 3 days preceding this event

Earthquakes of the 3 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 0.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 72 hours preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes of the 90 days preceding this event

Earthquakes of the 90 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 2.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 90 days preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes from 1985 to the date of the event

Earthquakes from 1985 to the date of the event

This map shows the earthquake epicenters with magnitude ≥ 3.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, from 1985 to the date of this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes since 1000 AD until 2019

Earthquakes since 1000 AD until 2019

This map shows the epicenters of the historical earthquakes catalogue CPT15 (Catalogo Parametrico dei Terremoti Italiani, 2015 version 3.0, https://doi.org/10.13127/cpti/cpti15.3) since 1000 AD until 2019. The size of the square indicates the different classes of magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The black and white star is the epicenter of the current earthquake.
Seismic hazard

Seismic hazard maps provide probabilistic estimates of the earthquake ground shaking exceeding a given threshold in a given geographic region within a given time window. Thus, it is not a deterministic prediction - a target that may be never reached given the complexity of the earthquake physical phenomenon - nor of the maximum expected earthquake since this has extremely low probabilities to occur.

In 2004, it was published the seismic hazard map of Italy (http://zonesismiche.mi.ingv.it) that provides a picture of the most hazardous geographic regions. The seismic hazard map of Italy (GdL MPS, 2004; rif. Ordinanza PCM del 28 aprile 2006, n. 3519, All. 1b) provides the 10% probability of exceedance in 50 years of the horizontal acceleration at rock sites (i.e., Vs30>800 m/s; cat. A, 3.2.1 of the D.M. 14.09.2005).

The colours indicate the various values of the ground acceleration that have 10% to be exceeded within 50 years. In general, the colours associated to low values of acceleration refer to areas that are less hazardous and stronger earthquakes repeat less frequently although they may still occur.

Seismic hazard map

Seismic hazard map

This map shows the seismic hazard map of Italy for the region where the earthquake occurred.
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000
Md 2.9
ML-VAX 1.9
1989-04-26
08:23:18
42.27 12.838 10 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 90649
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1989-04-26 08:23:18 ± 0.194
Latitude 42.2700 ± 0.0098
Longitude 12.8380 ± 0.0240
Depth (km) 10 ± 5 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 90649

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) 2257.2
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 122
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.7
Epicentral distance of station closest to the epicenter (degree) 0.00146
Epicentral distance of station farthest from the epicenter (degree) 0.01619
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 13
Magnitudes information

Md:2.9

Field Value
Value 2.9
Uncertainty
Num. used stations 5
Type of magnitude Md
Reference to an origin 90649
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 18:25:02

ML:1.9

Field Value
Value 1.9
Uncertainty
Num. used stations 3
Type of magnitude ML
Reference to an origin 90649
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 13:07:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
--.ARV.Z. 1989-04-26T08:23:59.00 10.0 undecidable manual SN 3 1.221 1.01 0.2
--.PGD.Z. 1989-04-26T08:23:50.80 10.0 undecidable manual PN 333 1.7982 1.11 0.4
--.CM8.Z. 1989-04-26T08:23:50.80 10.0 undecidable manual SG 13 0.9435 0.13 0.7
--.SDI.Z. 1989-04-26T08:23:49.56 10.0 undecidable manual SG 127 0.9102 0.1 0.5
--.SS8.Z. 1989-04-26T08:23:46.20 10.0 undecidable manual SG 21 0.777 0.67 0.6
--.ASS.Z. 1989-04-26T08:23:46.36 10.0 undecidable manual SG 350 0.7992 0.42 0.5
--.ALP.Z. 1989-04-26T08:23:44.40 10.0 undecidable manual SG 46 0.7326 0.5 0.7
--.AM8.Z. 1989-04-26T08:23:43.90 10.0 undecidable manual PN 23 1.3875 0.49 0.8
--.ARV.Z. 1989-04-26T08:23:41.00 10.0 undecidable manual PN 3 1.221 -0.16 1.1
--.SDI.Z. 1989-04-26T08:23:36.34 10.0 undecidable manual PG 127 0.9102 0.11 1.3
--.RDP.Z. 1989-04-26T08:23:36.50 10.0 undecidable manual SG 189 0.5106 -0.74 0.4
--.CM8.Z. 1989-04-26T08:23:35.30 10.0 undecidable manual PG 13 0.9435 -1.63 0.5
--.SS8.Z. 1989-04-26T08:23:33.00 10.0 undecidable manual PG 21 0.777 -0.96 1.6
--.ASS.Z. 1989-04-26T08:23:33.38 10.0 undecidable manual PG 350 0.7992 -0.82 0.9
--.CP9.Z. 1989-04-26T08:23:32.48 10.0 undecidable manual SG 168 0.4107 -1.02 0.3
--.ALP.Z. 1989-04-26T08:23:32.10 10.0 undecidable manual PG 46 0.7326 -0.92 1.7
--.RDP.Z. 1989-04-26T08:23:28.61 10.0 positive manual PG 189 0.5106 -0.3 2.7
--.AQU.Z. 1989-04-26T08:23:28.74 10.0 positive manual PG 78 0.4218 1.57 0.6
--.RMP.Z. 1989-04-26T08:23:28.38 10.0 undecidable manual PG 192 0.4662 0.39 1.2
--.CP9.Z. 1989-04-26T08:23:26.84 10.0 positive manual PG 168 0.4107 -0.17 2.8
--.MNS.Z. 1989-04-26T08:23:26.62 10.0 undecidable manual SG 314 0.1665 1.32 0.2
--.MNS.Z. 1989-04-26T08:23:22.77 10.0 positive manual PG 314 0.1665 0.49 2.4
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Fault Plane solutions

Fault Plane solutions

The map reports the fault plane solutions for earthquakes in the region from 1977 to the date of this event. Red moment tensors are determined using the Regional Centroid Moment Tensor technique (RCMT, http://www.bo.ingv.it/RCMT) applied for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when a station azimuthal coverage exists RCMTs can be obtained also for earthquakes with magnitude down to 4.0. The gray moment tensors are obtained with the Time Domain Moment Tensor method (TDMT, /tdmt). This technique is applied to earthquakes with magnitude ML greater than 3.2, when it is possible. The size of symbols scales with the calculated moment magnitude Mw.
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download